What was found
AIRCRAFT WAS GROUNDED: DUE TO REPORTED SOF EVENT COMPLY WITH SOF TROUBLESHOOTING JOB CARD. REF. MIC #S 7297555, 7297635, AND 7298513. COMPLETED SOF JC 26L0021001. FOUND HAND PUMP FILL VALVE LEAKING SKYDROL UP INTO APU INLET. MAINTENANCE REPLACED HAND PUMP FILL VALVE IAW AMM 29-16-42.