As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ADDING TAKEOFF POWER CAPT'S EADI AND EHSI FAILED AND CAME BACK ON LINE. AFTER 100 PERCENT TORQUE AND DOUBLE CHECK OF ALL INSTRUMENTS, TAKEOFF ROLL WAS COMMENCED AND ABORTED AFTER CAPT EHSI CHANGED HDG FROM 250 TO 270 DEGREES. INSTALLED AND REORIENTED SERVICEABLE AHC-85 AND PERFORMED RUN UP TO 100 PERCENT TORQUE SEVERAL TIMES WITH NO ABNORMALITIES NOTED. S/N ON 1336, S/N OFF 1726. OPS CHECK GOOD.