What was found
UPPON ARRIVAL FOUND APU INOP, VSAL AIR START CART TO START #1 ENGINE WITH NO ISSUES CROSS BLEED START #2 ENGINE ALSO HASD NO ISSUES. BOTH IDG'S PICKUP WITH GOOD ELECTRICAL POWER. REPAIRED APU. REPLACED HMU AND FUEL PUMP OK TO INSTALL PERFORMED BY 31619. INSTALLED PER AMM 73-21-10&73-91-01 TESTED PER AMM 71-00-00-801-811 FOUND NO LEAKS WHEN NOTED AND ALL TESTS PASSED.RAN BOTH ENIGINES MULTIPLE TIMES SHUTTING ONE ENGINE OFFAT A TIME , TO MAKE SURE ELECTRICAL POWER SWITCH BUSSES AND NO PROBLEMS WHEN NOTED. ALSO RAN FLAPS AND SPEED BRAKES WITHOUT ANY ISSUES