Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
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As for the fault code that was reset: what did the technician 'hit' accidentally? I presume the Xerox was in service mode, where stored values of great significance could be altered.
Has the change to that code been saved?
I regret that I have no information on the 'correct' value of 744-003.
I can find no information on that after a search.
Perhaps a service manual might contain the information about that memory location... would you be interested in a referral to a source for a service manual for this Xerox 770 Digital Press model?
As for error 10-320... on some Xerox machines it is a reset for location 744-350 and that location needs a reset to 0... but I would still prefer to cite (or if I had it, to quote from) a service manual for the 770, not information from some other Xerox model.
You're welcome. The 744-350 location is for the DocuColor series.
As for a service manual for the 770... I regret that I cannot locate a source for one on a casual search.
Having come up with only so much, I must Opt Out of this case, with apologies - the case is now opened to other Experts in this category, one of which may have more information to offer.