As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ENGINE START THE RT ITT INDICATOR SHOWED NO INDICATION ON THE TAPE OR DIGITAL INDICATORS. NO ENGINE COMPUTER FAULTS WERE INDICATED. MEL ALLOWS FOR THE TAPE OR THE DIGITAL TO BE INOPERATIVE BUT NOT BOTH. A SPECIAL FLIGHT PERMIT WAS ACQUIRED AND THE ACFT WAS FLOWN BACK TO HOME BASE WITHOUT INCIDENT. A REPLACEMENT INDICATOR WAS ACQUIRED AND INSTALLED WHICH CORRECTED THE PROBLEM. IT IS BELIEVED THAT A DEFECT WAS CREATED DURING THE O/H PROCESS WHICH CAUSED THIS ISSUE.