As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CYLINDER NR 1 WAS RUNNING TOO COOL. WEAK COMPRESSION WAS NOTED PULLING PROPELLER THROUGH. COMPRESSION TEST RESULTS 65/80. FERROUS METAL NOTED IN FILTER ELEMENT. ROCKER COVER WAS REMOVED. ROCKER ARM FOR EXHAUST WAS HITTING ON SPRING RETAINER. END OF EXHAUST VALVE WAS WORN DOWN TO KEEPER. CONTINUED OPERATION WOULD HAVE RESULTED IN CATASTROPHIC FAILURE WITH VALVE DROPPING INTO CYLINDER. SAME PROBLEM AS NOTED IN TCM CSB 98-1B. (X)