As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE NOT DEVELOPING INCHES OF HG. AFTER RUN-UP AND ATTEMPTED TO ADJUST DENSITY CONTROLLER, WASTEGATE (VALVE - EXHAUST BYPASS) WAS CHECKED AND BUTTERFLY VALVE FOUND TO BE ROTATING FREELY ON ITS SHAFT. AFTER REMOVAL OF SAID PART, THE WASTEGATE VALVE WAS INSPECTED AND SHOWED SIGNS OF CORROSION, CRACKING AND CORRODED/SHEARED HOLDING STUD. ENGINE WAS ON CONDITION, NORMAL OPERATION WAS ACHIEVED AFTER REPLACEMENT OF PART.