As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM AS A CONSEQUENCE OF DURING TAXING, THE LEFT ENGINE GENERATOR WENT OUT OF ITS BAR TURNING ON THE MASTER CAUTION LIGHT AND THE LEFT OIL PRESSURE WAS LOW (30 PSI). DURING ENGINE CHECK THE FCU DID NOT MAINTAIN THE RPMS IN IDLE AND DECREASED TO 32 RPM OF N2. LEFT FCU WAS REPLACED IAW MM 73-20-01 AND ENGINE WAS TESTED IAW MM 71-00-00, ALL CORRECT.