What was found
ENROUTE, RECEIVED A CHECK FIRE DET WARNING LT IT WOULD COME ON INTERMITTENTLY. RAN CHECK LIST AND RECEIVED A BTL LOW LIGHT. THAT LIGHT WAS ALSO COMMING ON AND OFF IT WENT OFF FOR ABOUT 5 FULL MINUTES AND RECEIVED LIGHT AGAIN IN THE DESCENT, ALL THE WAY TO THE GROUND. FOUND CONNECTOR 2600-P26 (APU FIRE DETECTOR) EXTREMELY LOOSE. RE-SECURED CONNECTOR. REF MEL 26-20-1. REMOVED JUMPER WIRES FROM PINS A & B ON APU FIRE BOTTLE CONNECTOR 2600-P12. RE-CONNECTED CONNECTOR 2600-P12 TO APU FIRE BOTTLE. PERFORMED OPS TEST OF APU FIRE DETECTION SYS IAW AMM TASK 26-13-00-710-801. OPS TEST GOOD. RETURNED TO SERVICE. NO PARTS REPLACED.