What was found
APU FAULT LIGHT ON START TURNED SWITCH OFF. LIGHT EXTINGUISHED IMMEDIATELY. ACFT GROUNDED. PERFORMED CDU INTERROGATION AND REPORTED FAULT CODE 49-41012. ATTEMPTED APU START SUCCESSFUL WITH NO FAULT LIGHT ILLUMINATED OR FAULT CODE REPORTED. THIS AFFECTS APU START CAPABILILITY FOR ETOPS FLIGHTS, PERFORMED 3 SUCCESSFUL APU STARTS AND PERFORMED CDU INTERROGATION BITE CHECK ON THE APU, REF FIM 49-40, TASK 803. NO FAULT LIGHTS, LIGHTS ILLUMINATED OR CURRENT FAULTS BEING LOGGED.