As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AIRWORTHINESS CHECK, A CRACK IN A PRE-EXISTING SKIN REPAIR LOCATED ON THE TOP DECK OF THE HELICOPTER BETWEEN THE SYS 1 AND 2 HYD FILTER MANIFOLDS AT APPROX BS 233. ON REMOVAL OF CRACKED PATCH, A TWO PART CRACK APPROX 5 INCHES RUNNING FORE & AFT WAS UNCOVERED IN THE ACFT SKIN UNDERNEATH. OPEN