As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENGINE MAKING STRANGE VIBRATION AND NOISE. #1 ENGINE VIBRATION AT .32 AMBER MESSAGE WITH "?" IN BLACK BOX. FL430 SPEED .82. AIRCRAFT DESTINATION WAS KVNY. CREW DECLARED AN EMERGENCY AND DIVERTED TO KAPA. PART 135 WAS CONDUCTING A 91 OPERATION WITH THE OWNER ONBOARD (1 PAX).