As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPLINES SEVERELY WORN AND 3 CRACKED. SUSPECT CAUSE DUE TO LENGTH OF CALENDAR TIME INSTALLED INDICATING A BREAK DOWN OF THE LUBRICANT. PERIOD OF INSTALLATION WAS 13 YEARS. SUBMITTER RECOMMENDS A CALENDAR LIMITATION OF 4 YEARS AS WELL AS THE EXISTING HOURLY FREQUENCY.