As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION WAS FOUND TO RIGHT UPPER, FWD COCKPIT FITTING. THE FITTING IS LOCATED AT RIGHT, LOWER END OF WINDSCREEN NEAR INSTRUMENT PANEL. IT IS SUSPECTED THAT CORROSON WAS CAUSED BY LEAKAGE FROM IMPROPERLY FITTED WINDSCREEN OR CONDENSATION.