As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CYLINDER EXHAUST VALVE GUIDE EXCEEDS LIMITS AS PER SB 388C. CYLINDER`S OVERHAULED 400HR PRIOR AT PREVIOUS SB TIME. VALVE PLAY EXACTLY THE SAME AS PRIOR TO OVERHAUL. BELIEVE OVERHAUL COMPANY MISTAKENLY SENT CYLINDERS BACK WITHOUT OVERHAULING.