What was found
IN 'NORMAL', BRAKES GRAB EITHER LEFT OR RIGHT. PEDAL OK IN 'ALTERNATE'. TOWER REPORTED A LITLE SMOKE ON TAXI OUT IAH. AIRCRAFT RETURNED TO RAMP - NR 5 TIRE ON INSPECTION SHOWED RUBBER RIBBONS ON CASE. BRAKE TEMPS NORMAL. INSPECTED ALL BRAKES IAW MM 32-42-00 - SYSTEM LEAK AND OPS CHECK GOOD. ROLLED NR 5 TIRE WHILE ON JACK - CHECKED GOOD. REMOVED AND REPLACED O-RING ON SWIVEL UNDER SERVO VALVE. LEAK CHECKED GOOD. (X)