What was found
AFTER LANDING, NR 4 BRAKE TEMPERATURE REACHED 600 DEGREES, FUSE PLUG DISCHARGED AFTER PARKING. PERFORMED BRAKE OVERHEAT INSPECTION IAW AMM 05-51-16, FOUND AXLE DISCOLORATION IN BEARING AREA OUT OF LIMITS. REPLACED AXLE IAW CMM REV.8 DATED 03/02/1998. A/C RETURNED TO SERVICE.