As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPRINGS ARE BROKEN IN THE AUXILIARY BRAKE SYSTEMS. IMPROPER HEAT-TREATING, AUSTENITE, FATIGUE AND INCREASED SPRING COIL. SPRINGS (PN 69-77855-1) ARE TO BE REPLACED WITH (PN 69-77855-2). SPRINGS ON ACTUATOR ASSEMBLIES MANUFACTURED PRIOR TO SERIAL NUMBER KEO1730 PER MFG SL.