As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ESCAPE PATH LIGHTING INOPERATIVE AT SEAT ROW 11 LEFT AND RIGHT SIDE, SEAT ROW 9 LEFT AND RIGHT SIDE. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT PER AMM 33-51-38 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.