Thanks for the story; that will be helpful to some poor sod in the future.
I have found that adding SYSCPK to TK3UPD is one of the easiest ways to get the extra compilers, rather than adding them one by one. There are plenty of 3350 addresses in TK3UPD...
No IMON: not present, or not working? I don't recall have to fiddle with it (except possibly adding a PROC so I can start it from the console w/ a dedicated terminal, bypassing TSO, but even that may have already been done).
