As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PN 383943 PLUG FOUND HANGING BY SAFETY WIRE WHEN TROUBLESHOOTING LACK OF POWER FROM ENGINE. THREADS IN COVER MISSING. THIS SERVO WAS NOT INCLUDED IN AD2008-08-14 DUE TO MFG DATE OF UNIT. THE SERVO WAS ORIGINAL EQUIPMENT ON A 2003, 172S, WITH A TT OF 2462.0 HOURS AND HAD NOT BEEN REPAIRED OR O/H. PLUG GASKET WAS MISSING. (K)