I would check the nicad batteries on th spu board. The processor has multiple purpose comports and dispatch failes when nicads go bad.
I don't recomend swapping boards from other group or job numbers because you would have to flash the program to match the job numbers you are swapping to.
I had a bad batch of software and when I flashed the spu back to return to its normal group, I had an issue that took 3 months and a software change to correct.
jferro@aceweb.com