What was found
MAIN ROTOR HEAD SIGHT GLASS HAS IMPERFECTIONS IN THE U-CHANNEL. UNIT NEVER INSTALLED. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
MAIN ROTOR HEAD SIGHT GLASS HAS IMPERFECTIONS IN THE U-CHANNEL. UNIT NEVER INSTALLED. REPLACED WITH NEW UNIT(S) CORRECTED PROBLEM.