What was found
COLD DARK AIRPLANE. PERFORM THE EMER LIGHT TEST AND WHEN SWITCH IS MOVED TO ON ALL EMER LIGHTS IN CANIN WORK EXCEPT FOR LOWER EXIT LIGHTS AT THE MAIN CABIN DOOR. WHEN SWITCH IS MOVED TO ARM, ALL EMER LIGHTS GO OUT. AFTER CHARGING THE PACKS OFF THE APU FOR TWENTY MINUTES THE LIGHTS WHERE TESTED ON DARK PLANE AGAIN AND WORKED NORMALLY. THIS HAPPENED THE LAST 2 DAYS. SUSPECT THAT EMER LIGHT BATTERY PACK 1 IS SLOWLY FAILING. COMPLETED THE TASK CARD FOR EXERCISING THE EMERGENCY LIGHT BATTERIES. ALL BATTERIES PASSED THE CHECK. MCC ELECTS NO FURTHER WORK AT THIS TIME.