What was found
WITH EQPT COOLING OPERATING IN STBY MODE DUE TO MEL 21-58-07 - AFTER TAKEOFF GOT AN OVHT LIGHT FOR THE EQPT COOLING. PLACED EQPT COOLING TO OVRD AND OVHT LIGHT WENT OUT. ELECTED TO OFF LAND TO JFK FOR FIX. CA FOUND SMOKE CLEARANCE VALVE V140 PARTIALLY OPEN AND INOPMANUALLY CYCLED VALVE SEVERAL TIMES THE VALVE STARTED TO WORREMOVED VALVE.REPLACED OVERRIDE VALVE OPS CK OK.ALSO SPEED CKS OK ETOPS CATEGORY 'B': DIVERSION OR TURNBACK