As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT COMPLAINED OF LOOSING POWER IN BOTH ENGINES ALTHOUGH NOT SIMULTANEOUSLY. DURING GROUND RUN BOTH WASTEGATES WERE FOUND STUCK IN THE OPEN POSITION. AFTER LUBRICATING WASTEGATE SHAFTS AND MOVING THEM BY HAND, SUBSEQUENT GROUND RUNS SHOWED NORMAL OPERATION. FAILURE INITIALLY OCCURRED EN ROUTE AT 19,000 FEET. MOUSE MILK WAS USED TO LUBE. RECOMMEND REGULAR LUBRICATION.