As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE THE LEFT ITT SHOWED 257 DEG C AND THE RIGHT SHOWED 706 DEG C ALL OTHER INDICATIONS WERE NORMAL AND NO CAUTION LIGHTS. FOLLOWED Q400 FIM 73-20-00 SUB TASK 73-20-00-810-006 SECTION A UP TO AND INCLUDING STEP 3, NO MAJOR ITT DIFFERENCE WAS NOTED DURING ENG RUNS, FAULT CODE 973 DID NOT REOCCUR AND ALL OTHER PARAMETERS NORMAL.