As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT AFTER 30 MINS, TRIPLE TACH N2 NEEDLE FAILED TO ZERO INDICATION AND UPON LANDING AFTER 25 MIN OF FLIGHT THE N2 INDICATION WENT BACK TO NORMAL INDICATION. NOTE: DURING ENGINE SHUTDOWN, N1 INDICATION OF ENGINE #2 BEGAN TO FLUCTUATE TO ZERO THEN BACK TO NORMAL INDICATION. REMOVED AND REPLACED NUMBER TWO ENGINE N2 SENSOR IAW ENGINE MANUAL 77-12-00-900-801-B01. MOC COMPLETED OK IAW RFM 29.1.