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 CARD 2908 THE EMERGENCY LIGHTS AT 12DEF OVERHEAD, ROWS 13, 14 AND 15 SEAT MOUNTED, AND ALL FOUR OVERWING EXIT LIGHTS FAILED BATTERY TEST. REMOVED AND REPLACED EMERGENCY POWER SUPPLIES M1694 AND M1695 IAW AMM 33-51-06. SYSTEM CHECKS NORMAL. SEE ALSO AALA20161211001.