As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) REPORTED BY FLIGHT CREW - WITH PROPELLER BRAKE APPLIED, PROPELLER RELEASED UN-COMMANDED AND BEGAN TURNING. TOOK MORE THAN ONE ATTEMPT TO APPLY BRAKE TO STOP PROPELLER. NOTE: MAINTENANCE WAS UNABLE TO DUPLICATE. PROPELLER BRAKE WAS REPLACED REGARDLESS, FOR SAFETY CONCERNS. WILL REQUEST A TEAR DOWN AND TEST REPORT FROM REPAIR STATION. THIS WAS SECOND UNIT REPLACED IN 12 FH, FOR TWO DIFFERENT DEFECTS. (TC# 20190226014)