What was found
NOTICED THE LOWER MAIN CABIN DOOR "EXIT" LIGHTED SIGN WOULD EXTINGUISH AFTER A LONG SIT. WOULD WORK AGAIN AFTER BATTERIES RECHARGED. CORRECTIVE ACTION: REMOVED NO. 3 EMER BATTERY PACK PN: CBS28-1 SN: 009139 . INSTALLED NEW CUSTOMER SUPPLIED NEW EMER BATTERY PN: 6430028-1 SN: K25-15239. REMOVED NO. 4 EMER BATTERY PACK PN: CBS28-1 SN: 009466.INSTALLED CUSTOMER SUPPLIED NEW EMER BATTERY PN: 6430028-1 SN: K25-15240. WORK PERFORMED IN REF TO CESSNA MODEL 680A AMM 33-50-06. OPS CHECK GOOD