As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THREE EACH EMER EXIT LIGHTS IN CABIN INOPERATIVE. ONE AT LT AFT EXIT HATCH DEDO WALL LIGHT. ONE AT RT FWD EXIT HATCH DEDO WALL LIGHT & ONE AISLE LIGHT AT SEAT 22C. SYS TESTED EMER LIGHT, GOT EPSU BATTERY EMER LT REPLACED 12WL BATTERY. EPSU TESTED OK. NOW THE SYS IS FAULTING EPSU BATTERY AFT LT, FOUND PUSHED BACK PINS. NOW TESTS OK & OPERATIONS CHECKED OK.