As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING SB PRS-107, FOUND PN 383493 HEX NUT ACCESS PLUG FINGER LOOSE. ALSO, FOUND RED DYE INSIDE FUEL SERVO AIR CHAMBER. THIS AC HAS HAD AN ISSUE WITH LEAN IDLE MIXTURE IN THE PAST. NOTE: HEX NUT WILL BE LOOSER IF ENGINE IS WARMED UP. SUSPECT UNDERTORQUED FROM FACTORY AND RED DYE NOT FLUSHED FROM CHAMBER. SENT TO OVERHAUL FACILITY TO HAVE CORRECTED AND PERFORMED THE REQUIREMENTS OF PRS-107 SB. (K)