As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EQUIPMENT COOLING MASTER CAUTION & EICAS MSG IN CRUISE. RAN THE CHECKLIST & MSG RETURNED. DIVERTED TO NEAREST AIRPORTPER NNC. T/S PER FIM MSG 21421, FOUND E/E RACK FLOW SENSOR M7934 CONTAMINATED, CLEANED & INSTALLED SENSOR PER AMM 21-58-02. E/E COOLING TEST OK PER MM 21-58-00. NO FAULT NOTED AT THIS TIME.