As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORT - 800 DEGREE CHECKS OK, ADVANCED POWER AND STARTED TAKEOFF ROLE. TIT, FF AND POWER NORMAL, HOWEVER RPM INDICATION WAS DECAYING. TAKEOFF ABORTED AND ACFT TAXIED BACK TO BASE. TROUBLESHOOTING FOUND REGULATOR TO BE FAULTY. REGULATOR CHANGED.