What was found
FAULT LIGHT ILLUMINATED DURING APU START TWICE AT FL360. SUCCESSFUL CSS ACCOMPLISHED AFTER FAULT LIGHT EXTINGUISHED AT FL310. GROUNDED-YES. PERFORMED B737-800 FIM 49-30 TASK 803, OVERTEMP SHUTDOWN, APU BITE TEST FAULT HISTORY MAINT MESSAGE, CDU SHOWS 49-31016. VISUAL INSPECTION GOOD ON TAIL CONE AREA & ADJACENT CONTROL SURFACES AT THIS TIME. INSPECTED ON GROUND ONLY. PERFORMED APU STARTING AND OPERATION, REF B737-800 AMM 49-11-00-860-801 APU STARTED FINE WITH NO FAULT LIGHT ILLUMINATED. PERFORMED APU BITE PROCEDURE, REF FIM 49-60 TASK 801, NO MAINT MESSAGE NOTED AT THIS TIME.