As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EQUIPMENT COOLING EICAS MSG DISPLAYED DURING PUSHBACK FOLLOWED BY "E/E COOLING CARD" EICAS. A/C RETURN TO GATE. A/C TEMP IN FWD CARGO COMP HAD INCREASED TO 37°C. A/C SHUTDOWN AND COOLED W/ AN AC CART FOR 30 MIN. ALL MSGS CLEARED PER AMM 21-23-00 AND 12-01-00. A/C MX RD AT 0200Z/29.