As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) OVERHAUL ENGINE WAS INSTALLED AT 7117.6. IN THE PROCESS OF DOING A 100 HOUR, FOUND NR 1 CYLINDER VERY LOW ON COMPRESSION. REPLACED CYLINDER WITH OVERHAULED CYLINDER. CHECKED COMPRESSION AFTER INSTALLATION AND COMPRESSION WAS WHERE IT WAS SUPPOSED TO BE. GROUND RUN NO FAULTS FOUND.