I'm reviving this thread, because I seem to have a very similar issue and am not sure how to progress.
This is a 754D that had a plethora of errors, most of which got solved by replacing SRAMs serving U200 (so, if the sequencing described by Jay applies to this acquisition board, that'd be CH4, but it seems to impact all channels apparently). The root cause was (possibly alongside other types of failures of the SRAMs) a low-resistance condition between pins 2 and 3 of those SRAMs (corresponding to A16 and A14, all addresses being in parallel across the eight ICs) of about 10 ohms. I had to remove seven of the eight chips before this condition was eliminated (one original SRAM left on that channel). Once I did that, all errors pointing to specific U201 through U216 went away.
I've also reflowed all pins for U200 to eliminate cold joints being as a possible cause.
I have on error left: "diagnostic test failure, digDataFormatDiag, ERROR!!BYTE mode, in demux 200 ,i= 4 memBaseAdr 0x738000a= data = fffffa00, expectedData[i] = aa00" This seems to generate some spurious peaks, just like Jared seemed to experience (I'll enclose a picture shortly).
Not sure what else to look for to narrow down the issue left.
Radu.
