What was found
AFTER REPLACING BATTERY IN REAR EPSU, PTP TEST DISPLAYS *EPSU AFT L*. REPLACED POWER SUPPLY. TESTED THROUGH PTP AND GOT GREEN OK LIGHT AND TEST OK MESSAGE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER REPLACING BATTERY IN REAR EPSU, PTP TEST DISPLAYS *EPSU AFT L*. REPLACED POWER SUPPLY. TESTED THROUGH PTP AND GOT GREEN OK LIGHT AND TEST OK MESSAGE.