As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE WILL NOT ROTATE FOR START, START VALVE LIGHT ON AND PRESSURE DROP NOTED. REPLACED STARTER & VALVE, NO HELP. SUSPECT STARTER DRIVE PAD COUPLING SHEARED, CHECKED N2 ROTOR FOR TURNING USING MANUAL CRANK PAD ON THE IDLER PAD OF THE OIL PUMP. COUPLER AND REMOVAL TOOL ON FLT 972 ETA 0920. REPLACED ENGINE 2 STARTER COUPLING. OPS NORMAL.