As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR 2 INPUT CHIP INDICATION TRIGGERED IN FLIGHT, AIRCRAFT RETURNED TO BASE. FOLLOW UP INSPECTION OF NR 2 INPUT MODULE CHIP DETECTOR WAS CARRIED OUT. TWO RIVETS HEADS WERE FOUND BRIDGING THE DETECTOR GAP. DURING REPLACEMENT OF THE INPUT MODULE TWO ADDITIONAL RIVET HEADS WERE DISCOVERED. (TC# 20090930002)