What was found
APU FIRE GOING INTO ASE, DIVERT TO GJT. APU SHUT ITSELF DOWN. (FLIGHT 3077 - FILED CLOSED) OPENED APU ACCESS DOORS AND VISUALLY INSPECTED APU AREA FOR EVIDENCE OF SMOKE, FIRE OR HEAT DAMAGE. NO DEFECTS NOTED. INSPECTED WIRING HARNESS'S AND APU GEN CONNECTIONS WITH NO DISCREPANCIES NOTED. NO EVIDENCE OF BLEED LEAK NOTED. INSPECTED FIRE LOOPS WITH NO EVIDENCE OF DAMAGE NOTED. NO EVIDENCE OF FUEL LEAK NOTED. NO PREVIOUS HISTORY NOTED.MDC INDICATES FAULT CODE B1-005970 OCCURED PRIOR TO APU SHUTDOWN, REFERENCING MHIRJ FIM 49-61-01-810-802 APU ECU IS DEFECTIVE. REFERENCE AML FOR APU ECU DEFERRAL.