What was found
APU FIRE WARNING MESSAGE WITH ASSOCIATED AURAL AND VISUAL WARNING, APU FAULT MESSAGE ALSO APPEARED. COMPLIED WITH IMMEDIATE ACTION CHECKLIST AND QRH. EMERGENCY LANDING IN CLT. BOTTLES NOT DISCHARGED. INSPECTED APU INTAKE AND APU COMPARTMENT, NO EVIDENCE OF FIRE, SUSPECT FAULTY APU FIRE DETECTION LOOP. FOUND TWO LOOSE CLAMPS, ADJUSTED ROUTING OF SENSOR ELEMENT AND RECONNECTED TWO EACH CLAMPS. OPS CHECK GOOD. (M)