As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*SUPPLEMENTAL SDR* *AIR TURN BACK* EQUIPMENT OVHT EICAS AND ANNUCIATOR RECEIVED AFTER T/O. THE CHECK LIST DID NOT FIX THE OVHT. RESULTED IN AIR TURNBACK. REMOVED AND REPLACED CABIN AIR RECIRCULATION FAN (LEFT) REF AMM 21-25-01-404-094 OPS CHECKS GOOD.