As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL330, LEFT ENGINE OVHT LIGHT ON PEDESTAL. RETARDED ENG TO IDLE, LIGHT REMAINED ON FOR APPROX 3 MINUTES. NO ASSOCIATED MASTER CAUTION OR EICAS MESSAGE. REPLACED OVHT DET LOOP M684 AND LOGIC TEST CARD. ALSO, CHECKED ALL CLAMPS ON ENGINE AND TIGHTENED SAME. SYSTEM CHECKS OK.