As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT THE UNINTERRUPTABLE POWER SUPPLY, FOR THE FLY-BY-WIRE SYSTEM WOULD NOT TEST. SUBSEQUENT INVESTIGATION RELEVELED THAT WIGGLING THE CIRCUIT BREAKER ON THE FRONT OF THE UNIT WOULD CAUSE THE UNIT TO INTERMITTENTLY START AND FAIL. UNIT HAD RECENTLY BE MODIFIED IAW MFG CUSTOMER BULLETIN 104A.