What was found
NOSE GEAR COLLAPSED ON LANDING ROLL OUT, PLACED AIRCRAFT ON JACKS TO TROUBLE SHOOT AND FOUND NOSE GEAR DOWN LOCK TO HAVE A CRACKED DOWN LOCK CASTING THAT FAILED,(PART WHEN REMOVED SHOWED SIGN OF AN OLD CRACK NOT VISIBLE WITH OUT REMOVAL). REPLACED DOWN LOCK ASSY. WITH NEW PART P/N 38078-02. ADJUSTED DOWN LOCKS, PERFORMED NUMEROUS RETRACTION BOTH MANUAL AND EMERGENCY AS PER PIPER PA32R-300 MAINTENANCE MANUAL, OPERATIONAL CHECK GOOD.