As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. PER CARD 2908 EMERGENCY LIGHTS SIGN (OVER WING HATCH SIGN) ROW 13, 14 AND 15 RIGHT HAND SIDE FAILED TO STAY ON DURING TEST OF BATTERY PACK CAPACITY CHECK. REPLACED POWER SUPPLY (M1695) PER AMM 33-51-06, OPERATIONS CHECK NORMAL.