As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT CAME IN REPORTING LOWER ENGINE POWER AND HIGHER THAN NORMAL MANIFOLD PRESSURE AT LOW POWER SETTINGS, AME FOUND MANIFOLD PRESSURE FIREWALL TO GAGE LINE ASSY HAD BEEN FIELD REPAIRED USING ALUMINUM TAPE. LINE R & R WITH SERVICEABLE UNIT.