What was found
(CAN) WHEN INSTALLING THE MAIN ROTOR BLADES, FOUND VISUAL INDICATION OF A CRACKED MAIN ROTOR BLADE BOLT. COMPLETED A LIQUID PENETRATE INSPECTION ON ALL 8 BOLTS AND FOUND 2 BOLTS SUSPECTED OF BEING CRACKED. BOLTS WERE SENT TO FOR MAGNETIC PARTICLE INSPECTION, THEY ALSO CONFIRMED BOLTS WERE CRACKED BY MPI AND LPI. THIS ACFT WAS INVOLVED IN A SUDDEN STOPPAGE IN OCT OF 2013 AND HEAD WAS OVERHAULED IAW OHM THE BLADE BOLTS ARE REQUIRED TO BE MPI`D. THE WORK ORDER WAS OBTAINED AND THE MPI WAS COMPLETED ON NOV 4 2013. THE CRACKED BOLTS WERE REPLACED WITH O/H BOLTS.