As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT TEST FAILURE. FOUND EPSU 13WL AT AFT CENTER GALLEY UNIT FAULT TEST LIGHT ON. REPLACED EPSU MR33131-317. REMOVED AND INSTALLED -409. ALSO REPLACED BATTERY. DOES NOT HELP. SWAP EPSU AND NOT HELP. RE-LOCATED UNITS TO ORIGINAL POSITION. REPLACED EPSU 13WW AND BATTERY OPS NORMAL. ALSO REPAIRED SHORTED WIRES UNDER SEAT 23ABC.