As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI ,EICAS "FWD EQUIP OVHT: DESCREET LT "OVHT", WENT TO STBY AND BOTH INDICATIONS RETURNED AC RETURNED TO THE GATE (BTB) AND MTX GROUNDED AC . MTX DEFERRED FWD EQUIP. COOLING IAW MEL-ABX-21-58-1-1 . FOR DEPARTURE AND RETURNED AC TO SERVICE