What was found
WHILE TAXIING INTO THE GATE, THE BELOW-THE-WING PERSONNEL NOTICED THAT THERE WERE FLAMES COMING FROM THE NR2 AND NR6 BRAKES. ACS EXTINGUISHED FIRE ON BRAKES USING DRY CHEMICAL. FOUND UPPER PISTON PUCK ON NR 1 BRAKE SEPARATED FROM PISTON. INSPECTED AXLES FOR DISCOLORATION OR PAINT BLISTERING. NONE FOUND. NO TIRE FUSE PLUGS BLOWN. REPLACED NR 1, NR 2, NR 5 AND NR 6 BRAKE AND WHEEL ASSEMBLIES. OK FOR SERVICE.