What was found
DISCREPANCY; #1 engine #10 cylinder left side shorted secondary, and running rough. #1 engine backfiring, and BMEP erratic at all power settings.CORRECTIVE ACTION; Replaced #10 coil and #10 cylinder.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DISCREPANCY; #1 engine #10 cylinder left side shorted secondary, and running rough. #1 engine backfiring, and BMEP erratic at all power settings.CORRECTIVE ACTION; Replaced #10 coil and #10 cylinder.