What was found
DURING TAXIING OF FLIGHT TP842 FROM CUZ TO LIM, THE AIRCRAFT RETURNED TO THE GATE DUE TO FUEL LEAK COMING FROM THE DRAIN VALVE OF THE LH FUEL TANK. ONCE AT THE GATE, MAINTENANCE PERSONNEL FOUND THE DRAIN VALVE OF THE LH FUEL TANK INNER CELL PARTIALLY OPEN, SO THEN, THEY FULLY CLOSED THE DRAIN VALVE AND PERFORMED OPERATIONAL TEST IN ACCORDANCE WITH AMM 12-32-28-281-804-A, VERIFIED THE VALVE WORKS NORMAL, THE FUEL LEAK STOPPED, AFTER THAT CORRECTIVE ACTION THE AIRCRAFT WAS RETURNED TO SERVICE.