As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS BLEED OFF ENG L MESSAGE RESET AND TRIPPED AGAIN APPROX 40 MINUTES LATER. A/C RETURNING TO ATL FOUND MAINT MESSAGE 36-10500. MANIFOLD DUAL TEMP SENSOR LEFT FAILED. REPLACED SAME PER M/M. RAN ENGINE TO POWER AND ALS PERFORMED ENGINE BLEED AIR OPERATIONAL TEST PER M/M. NO MESSAGES. OPS CK GOOD. ETOPS CATEGORY 'B': DIVERSION OR TURNBACK.