As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT FELT HARMONIC VIBRATION DURING REDUCE POWER DECENT INTO DIP SITE. FOUND T/R DRIVE SHAFT PN 204-040-623-011 RUBBING ON 205-060-923-001 BOOT ASSY. BOOT SEAL ECE-300-3/3 OIL SOAKED AND DEBONDED FROM BOOT LETTING BOOT SIDE. DOWN AND AMAKING CONTACT WITH T/R DRIVE SHAFT. BOOT AND SEAL ARE BONDED WITH M-24 BOND MASTER. BHT-IPC-71-5-39.