As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FUNCTIONAL CHECK FLIGHT RT ENG COMPRESSOR STALLED. ENG STABILIZED WHEN THROTTLE REDUCED TO MID-POINT. EMER DECLARED FLIGHT RETURNED & LANDED WITHOUT INCIDENT. ACCOMPLISHED BORESCOPE WITH NO FAULTS FOUND. SYS GND CHECKED NORMAL OPERATION CLOSED.