On the other hand, might testing at 138 be a lot faster? I would think it would take a heck of a lot more time to test only a couple TPs at a time and constantly shuffle stuff around than fire up the whole thing at once. 138 is only 9 degrees away, a weeks journey at GEO, so it wouldn't take that long to move it. They would probably save that and move by testing everything at once and multitasking.
As pointed out above, 138 is a Canadian location, TT&C will be done from Canada, and it is a Canadian sat. They may not need much if anything in the way of FCC permission.
You can't test the full function and coverage of the spotbeams at 138 though.