As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE TORQUING OVER AND CONTACTING COWLING WITH NR 6 ROCKER COVER. THIS ACTION IS WEARING A DEEP GROOVE IN THE ROCKER COVER. COWLING IS SHOWING HEAT DAMAGE FROM THE EXHAUST SYSTEM. THIS AIRCRAFT MODIFIED AT RPM IN WACO, TX TO 335 HP UNDER RAM STC SE4327SW. TIME SINCE STC: 21.6 HOURS.