As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R1 EMERGENCY EXIT LIGHT FAILS OPS TEST. PREMATURE REMOVAL/INSTALLATION OFF MPN: 2012-1. REPLACED BATTERY, NO HELP. REMOVED AND REPLACED POWER SUPPLY/TRAY ASSY AND INSTALLED NEW BATTERY, OPS CHECKS NORMAL. OK TO CONTINUE. CHARGER/TRAY REMOVED P/N 2012-1 NO S/N NOTED.