What was found
UPON SERVICE CHECK, (ONE) EMERGENCY LIGHT BULB IN COCKPIT FAILED TO ILLUMINATE UPON TEST. RELAMPED, NOW BOTH BULBS OUT. TRIED ANOTHER BATTERY PACK, NO CHANGE. NOW (2) BATTERY PACKS INOPERATIVE. RELAMPED, BOTH BULBS (2 MC316) OPS CHECK GOOD WITH A KNOWN GOOD BATTERY PACK. INSTALLED BOTH BAD PACKS ON AT FORWARD GALLEY OUTBOARD WALL, OTHER AT FORWARD AISLE CEILING, OPS CHECK GOOD.