What was found
CLIMBING OUT OF AT 18,000FT STARTED TO GET INTERMITTENT APU FIRE WARNING FOLLOWED IMMEDIATE ACTION ITEMS & QRH. DECLARED AN EMERGENCY & RETURNED TO CLE. ON ARRIVAL, APU FIRE WARNING WAS GOING OFF INTERMITTENTLY AGAIN THRU LANDING. TROUBLESHOT APU FIRE DETECTION SYS. FOUND M334, M515 FIRE LOOPS FAILED. R&R IAW WDG 26-11-31.M.M. 26-15-14. ALSO FOUND KIDDE CONNECTORS 878581-01, D1446, D1448,D982 R&R IAW SWP 2062-16. OPS CHECK NORMAL, A/C OK FOR SERVICE.