As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT TURNED BACK SHORTLY AFTER TAKEOFF BECAUSE OF ITT INDICATION DROP TO 220 DEGREES. ENGINE SPLIT AND T5 THERMOCOUPLE HARNESS BLOCK WIRING FOUND INTERMITTENT, WHERE PEN SHOWS ON PIC, WHEN MOVED BY HAND HARNESS BLOCK REPLACED BY O/H UNIT.