As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOW MANIFOLD PRESSURE. THROTTLE ARM LOOSE ON CARBURETOR SHAFT. CAM FOR LANDING GEAR WARNING SWITCH BOTTOMS OUT ON SHAFT STEP PREVENTING PROPER ENGAGEMENT OF THROTTLE ARM AND SHAFT. DRILLED CAM TO ALLOW IT TO FIT OVER STEP ON THROTTLE SHAFT.