No.1 Advance Base Workshop

[Dave Block]

I have an undated 'official' RCOC Christmas card from my dad marked as 'No.1 Advance Base Workshop'. What kinds/types of vehicles would be allocated to this unit? He was rebadged to RCEME upon its formation and always told me that he was with 3CID. Did the ABW's remain part of RCOC or they change over to RECME as well?
If I can find his serial no. I'll go through Ottawa to get his service records, MLU appears to be a great place to start!

TIA, Dave