As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 1,200-HOUR INSPECTION OF INTERIOR OF FLIGHT CONTROL TUBES, 2 TUBES HAD INTERNAL RUST. REPLACED TUBES. (AD 74-07-01.) SUBMITTER STATED THIS INSPECTION INTERVAL IS ADEQUATE AND IT COINCIDES WITH THE AIRFRAME OVERHAUL CYCLE. BELL SB 47-11-73-1.