As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM, DURING TAXING CAPTAIN INFORMED THAT THE RT ENGINE DID NOT START, THERE WAS NO ROTATION OF N2. THE START VALVE WAS OPENED MANUALLY BUT THE STARTING WAS NOT POSSIBLE. THE STARTER WAS REPLACED BUT THE CONDITION CONTINUED. METALLIC DEBRIS WERE FOUND IN THE GEARBOX AND IN THE BEARING NR 5 CHIP DETECTORS; THE RT ENGINE WAS REPLACED IAW MPCM 71-00-02 AND TESTED IAW MPCM 71-00-01.