As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURN TO PLATFORM AS CONSEQUENCE OF ENGINE NR 1 SHOWS N2 46.5 PERCENT AND EGT 430. TRIM WAS ACCOMPLISHED AND PARAMETERS WERE WITHIN LIMITS. DURING OVERNIGHT SERVICE, THE FCU AND PRBC WERE REPLACED IAW MM 73-20-01 AND 75-31-01, RESPECTIVELY. TEST CORRECT IAW MM 71-00-01. (M)