As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#939, JFK-SJD. (AIRCRAFT PERFORMED AND AIR TURN BACK TO JFK). 'ENGINE 2 FADEC SYS FAULT ON CLIMBOUT. FAULT RESOLVED AND THEN REOCCURRED AT CRUISE. ALL ENGINE INDICATIONS NORMAL; SEE LOG PAGE 4165963, ITEM 2 (REMOVED AND REPLACED ENGINE 2 N2 SPEED TRANSDUCER 4065KS IAW AMM 77-11-23 AND TSM 77-11-00-810-811-A. OPS AND LEAK CHECK GOOD.) FOR CORRECTIVE ACTION.'