What was found
APU WILL NOT START. BOTH ENG GEN OPERATES NORMALLY. HYD MOTOR GEN VERIFIED IAW 24-25-00-501. APU INTAKE DOOR IS CLOSED. GND PNEUMATIC SOURCE FOR ENG START USED AT GVA. STARTER ROTATING AT APU START BUT RPM NOT RISING ON EICAS. APU STARTER REMOVED & NO DAMAGE FOUND ON STARTER AXLE OR APU STARTER GEAR CONNECTION. APU STARTER REPLACED IAW MM 49-41-01PB401 WITHOUT SUCCESS. TROUBLESHOOTING TO BE PERFORMED. AWA AMM 49-11-00 FAULT TREE 902 FIG 129 ESPECIALLY BLK 10. IAW IPC 49-27-00A-000A 030 STARTER CLUTCH PCN 265-3153 IF NEEDED. APU STARTER CLUTCH REPLACED IAW MM 49-41-06 P401 ONE SCREW REPLACED.