What was found
FWD EQUIPMENT COOLING EICAS MESSAGE CAME ON SHORTLY AFTER TAKEOFF, STBY MODE SELECTED, MESSAGE EXTINGUISHED AND CAME BACK ON IN 5 MINUTES. OVERRIDE MODE SELECTED. MESSAGE WENT OUT UNTIL JUST BEFORE LANDING. R & R EXHAUST FAN B-12 IAW FIM 21-58, FT 902, BLOCK 50 AND AMM 21-58-06. PERFOMED OPS CHECK NORMAL ON GROUND AT THIS TIME. LP 800759-5 - ADDITIONAL TS PERFORMED IAW SSM 21-58-00 CONFIRMED COMPONENT CONDITION FOR EQUIPMENT COOLING SYSTEM FOR ACFT ON GROUND TEMP GREATER THAN 45 DEG F. OPS IN AUTO/STBY AND OVRIDE MODE. OPS CHECKS OF MANIFOLD/OVERRIDE VALVE, SUPPLY, EXHAUST FANS/ALL VALVES OPERATION NORMAL ON GROUND IAW AMM 21-58-00, CONFIG 6, PAGE 514.