The 93C56 and 93C46 are both EEPROMs, so no help there. The 10358 *might* be a dual opamp, I'd have to check pinout...
I was hoping only one of them would be an EEPROM...
Since you have to guess here, I'd go with the one closest to the IC driving the ODO LCD...
-Charlie
That was the correct chip! Thank you! Now I have to find out what else could be causing my p0500 issue.