What was found
AIRCRAFT WAS GNDED. AIR INTERRUPT, EMER DECLARED, LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING TAKEOFF, MASTER CAUTION ILLUMINATED WITH, APU DETECTION INOPERATIVE LIGHT. DURING CLIMB, MASTER CAUTION ILLUMINATED WITH ALL FIRE WARNING & DETECTION LIGHTS. FOUND UNIT M237 NOT SEATED IN RACK & MULTIPLE OPEN LOOP FAULTS. R & R ENG, APU, APU FIRE & OVERHEAT MODULE M279 IAW AMM 26-10-01. COMPARTMENT OVERHEAT MODULE M237 IAW AMM 26-18-00. SEE ALSO AALA 20160329013.