As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB - ENG L SYS FAIL ENROUTE FOLLOWED BY REV L FAULT. PERFORMED EEC1 RTS TEST. TEST FAILED. EEC BOX FAULT. REMOVED & REPLACED EEC1 PER AMM 73-21-01. RTS TEST PASSED. PERFORMED FUNCTIONAL CHECK OK L REV PER AMM 78-30-00-720-801. OPS NORMAL. OK FOR SVC.