As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING MAIN SPAR REPLACEMENT AFTER COMPLETION OF SB 2/47, A SINGLE NOSE RIB WAS FOUND TO BE HEAVILY CORRODED. AIRCRAFT TT 22235.0. THE AIRCRAFT OPERATES ON FLOATS IN A CORROSIVE ENVIRONMENT. PREVIOUS CORROSION TREATMENT WAS NOT IN EVIDENCE (TC NR 20070404002)