What was found
SHIP 6716 - RECEIVED TE FLAP DISAGREE MESSAGE ON APPROACH WHEN FLAPS SELECTED TO 25 AND INDICATOR REMAINED AT 20. THE CREW PERFORMED GO-AROUND AND CONSULTED THE QRH. AN EMERGENCY WAS DECLARED WITH ATC. CORRECTIVE ACTION: MAINTENANCE COULD NOT DUPLICATE TE FLAP DISAGREE MESSAGE. NOTED FLAP ISLN VAL MESSAGE. FOUND RT OTBD FLAP TRANSMISSION TORQUE LIMITER TRIPPED. THE RT OUTBD FLAP TRANSMISSION OIL DRAINED. OIL NOTED AS VERY DARK WITH NO METAL. SERVICED TRANSMISSION. REPLACED LEAKING FLAP ISOLATION VALVE PACKING. OPERATIONAL CHECKS OK. (LP #6835502)