Strange ADVENT error messages (OS/8)

Today I set out to debug my other (previously donated/defective) 16K core board in order to have a full 32K in my 8/A. The board was completely dead (0000 at all locations). A quick test program to read all locations in field 4-7 and a little scope work (it's handy to have a current probe) showed that one of the two paralleled X Read/Write drive transistors was defective and so that stack current pulse was only half amplitude. After replacing the transistor, powering back up and booting OS/8 from my RL02, a MEM command now showed "32K MEMORY!" :) Everything pretty much seems to be working just like before (such as LUNAR in PFOCAL, and various BASIC programs). But when I attempt to run ADVENT I get the following bizarre error messages: DIVIDE BY 0 ID("IL 0000 DIVIDE BY 0 ID("IL 0000 DIVIDE BY 0 ID:SIL 0357 DIVIDE BY 0 IE\/IM 0000 BAD ARG IE\/IM 0000 ID:SIL 0357 IANBII 0000 IEG8IM 0000 IEH?IM 0000 IE BIM 7240 IAVBII 0000 and then it either returns to the dot prompt or crashes. This disk image works perfectly (including ADVENT) on my laptop running SIMH. This looks to me like part of a file is corrupted (the presumed garbles are repeatable), but I don't know which one... any thoughts? I haven't run a test pattern on the "new" core board and wonder if it could be the source of this error. Rick M. are you out there? ;) thanks for any help. -Charles