TFS 2013 Update 4 to TFS 2015 Update 3 Collection Error - upgrade

Question

Updating my TFS 2013 Update 4 collection to TFS 2015 Update 3. Using a backup of the production collection data in a DEV location. Did the backup with the production collection being detached. Didn't have any errors. The backup is 254GB.
This is the error currently stopping me from attaching the collection:
Msg 3732, Level 16, State 1, Line 93
Cannot drop type 'typ_ItemSpec2' because it is being referenced by object 'prc_QueryPendingChanges_MS'. There may be other objects that reference this type.
SET XACT_ABORT ON
SET NOCOUNT ON
DECLARE #status INT
DECLARE #procedureName SYSNAME = N'upd_VersionControlToDev14M80_PostSchema'
DECLARE #tfError NVARCHAR(255)
IF EXISTS (
SELECT *
FROM sys.triggers
WHERE name = 'trg_tbl_VCFirstRunProject'
)
BEGIN
DROP TRIGGER trg_tbl_VCFirstRunProject
END
IF EXISTS (
SELECT *
FROM sys.indexes
WHERE name = 'IX_tbl_VCFirstRunProject_OldServerItemPrefix'
AND object_id = OBJECT_ID('dbo.tbl_VCFirstRunProject')
)
BEGIN
-- Delete upgrade-only rows for $\, a few partitions at a time
-- We need dynamic SQL for this to be rerunnable.
EXEC #status = sp_executesql N'
DECLARE #batchStart INT = 1
DECLARE #batchEnd INT
DECLARE #end INT
DECLARE #batchSize INT = 50
-- Get the partition range
SELECT TOP (1)
#end = PartitionId
FROM tbl_VCFirstRunProject
ORDER BY PartitionId DESC
WHILE (#batchStart <= #end)
BEGIN
SET #batchEnd = #batchStart + #batchSize
DELETE tbl_VCFirstRunProject
WHERE PartitionId BETWEEN #batchStart AND #batchEnd
AND OldServerItemPrefix = N''''
OPTION (OPTIMIZE FOR (#batchStart=1, #batchEnd=50))
SET #batchStart = #batchEnd + 1
END
'
IF (#status <> 0)
BEGIN
SET #tfError = dbo.func_GetMessage(500004); RAISERROR(#tfError, 16, -1, #procedureName, #status, N'sp_executesql', N'DELETE tbl_VCFirstRunProject')
RETURN
END
DROP INDEX IX_tbl_VCFirstRunProject_OldServerItemPrefix ON tbl_VCFirstRunProject
END
IF EXISTS (
SELECT *
FROM sys.columns
WHERE object_id = Object_ID(N'dbo.tbl_VCFirstRunProject', N'U')
AND name = N'OldServerItemPrefix'
)
BEGIN
ALTER TABLE tbl_VCFirstRunProject
DROP COLUMN OldServerItemPrefix, NewServerItemPrefix
END
IF TYPE_ID('dbo.typ_BranchObject2') IS NOT NULL
BEGIN
DROP TYPE typ_BranchObject2
END
IF TYPE_ID('dbo.typ_BuildMappingInput2') IS NOT NULL
BEGIN
DROP TYPE typ_BuildMappingInput2
END
IF TYPE_ID('dbo.typ_CreateLabelInput') IS NOT NULL
BEGIN
DROP TYPE typ_CreateLabelInput
END
IF TYPE_ID('dbo.typ_ExpandedChange2') IS NOT NULL
BEGIN
DROP TYPE typ_ExpandedChange2
END
IF TYPE_ID('dbo.typ_ItemSpec2') IS NOT NULL
BEGIN
DROP TYPE typ_ItemSpec2
END
IF TYPE_ID('dbo.typ_LocalPendingChange3') IS NOT NULL
BEGIN
DROP TYPE typ_LocalPendingChange3
END
IF TYPE_ID('dbo.typ_LocalVersion3') IS NOT NULL
BEGIN
DROP TYPE typ_LocalVersion3
END
IF TYPE_ID('dbo.typ_LockConflictCandidate2') IS NOT NULL
BEGIN
DROP TYPE typ_LockConflictCandidate2
END
IF TYPE_ID('dbo.typ_LockObject') IS NOT NULL
BEGIN
DROP TYPE typ_LockObject
END
IF TYPE_ID('dbo.typ_Mapping2') IS NOT NULL
BEGIN
DROP TYPE typ_Mapping2
END
IF TYPE_ID('dbo.typ_PendingAdd2') IS NOT NULL
BEGIN
DROP TYPE typ_PendingAdd2
END
IF TYPE_ID('dbo.typ_PendingChangeObject') IS NOT NULL
BEGIN
DROP TYPE typ_PendingChangeObject
END
IF TYPE_ID('dbo.typ_PendingChangeSecurity') IS NOT NULL
BEGIN
DROP TYPE typ_PendingChangeSecurity
END
IF TYPE_ID('dbo.typ_PendingMerge2') IS NOT NULL
BEGIN
DROP TYPE typ_PendingMerge2
END
IF TYPE_ID('dbo.typ_PendingPropertyChange2') IS NOT NULL
BEGIN
DROP TYPE typ_PendingPropertyChange2
END
IF TYPE_ID('dbo.typ_VersionedItemId') IS NOT NULL
BEGIN
DROP TYPE typ_VersionedItemId
END

Answer 1

None of the standard queries from Microsoft have _MS as a suffix. I suspect that someone hand-tweaked the original prc_QueryPendingChanges and left this around as a backup. In that case you should be able to drop this procedure and retry the upgrade.