As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TOWING AIRCRAFT INTO HANGAR, FLUID WAS OBSERVED ON THE RT MAIN WHEEL TIRE. INSPECTION REVEALED THE FLUID WAS COMING FROM ONE OF THE BRAKE PISTONS. BRAKE ASSY WAS REPLACED. NOTE: THERE WAS STILL 9MM OF THE WEAR INDICATOR SHOWING.