As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI FOR EVAL. FLIGHT CAPTIANS PITOT HEAT EICAS MSG APPEARED AND AC RETURNED TO GATE AND MTX GROUNDED AC , AFTER TROUBLE SHOOTING FOUND HEATER COIL FOR CAPTS. UPPER PITOT PROBE SHORTED TO GROUND. REMOVED AND REPLACED LH UPPER PITOT STATIC PROBE IAW B767 AMM 30-31-00 AND 34-11-01. OPS CHECK GOOD . AC WAS RETURNED TO SERVICE .