As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(VJ3R)ON PHASE RUN UP MECHANIC NOTICED THE GYRO WARNING LIGHT ON. UP ON TROUBLESHOOTING THE MECHANIC DETERMINED THE VANES ON THE AIR PUMP WERE WORN AND WAS NOT PRODUCING ENOUGH PRESSURE. INSTALLED NEW PUMP, SYS WORKED NORMAL. NO PROBABLE CAUSE OR RECOMMENDATIONS AT THIS TIME.