What was found
APU FAULT LIGHT ILLUMINATED ON 1ST APU START ATTEMPT OF CSS AT FLIGHT LEVEL 360. SECOND ATTEMPT DESCENDING THROUGH 35,000' WAS SUCCESSFUL. ACFT GROUNDED. TECH SERVICES REQUESTS FUEL CONTROL CHANGE ON APU. REPLACED APU FUEL CONTROL IAW AMM 49-31-11. PERFORMED SUCCESSFUL GROUND VERIFICATION, OPS TEST GOOD, NO LEAKS FOUND, APU BITE CK PERFORMED, NO CURRENT FAULTS FOUND.