As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. DURING ACCOMPLISHMENT OF MCM 2908 THE LEFT CEILING EMERGENCY LIGHT BETWEEN ROWS 23 AND 30 FAILED TEST. REMOVED AND REPLACED RIGHT REAR AFT PASSENGER DOOR EMERGENCY POWER SUPPLY IAW 33-51-06. OPERATIONAL CHECKS NORMAL.