What was found
WHILE DOING A 100HR INSPECTION ON THE AIRCRAFT, AME'S NOTICED BELLY SKIN ON LOWER RT SIDE WRINKLED. FURTHER INSPECTION REVEALED THAT THE WEB SKIN ON THE REAR OF THE FUSELAGE FRONT SPAR SKIN WAS CRACKED. THE PROTECTIVE TOP CAP OF CARPET WAS REMOVED AND IT WAS DISCOVERED THAT THE UPPER SPAR CARRY THRU WAS BROKEN. AIRCRAFT WAS TAKEN APART AND THE FUSELAGE FRONT SPAR ASSEMBLY WAS REMOVED AND WILL BE REPLACED. INSPECTION OF THE TECHNICAL RECORDS SHOWED THAT THE AIRCRAFT HAD BEEN DAMAGED AFTER A NOSE GEAR COLLAPSE AND REPAIRED IN 1979. THE SKIN UNDER THE DOOR HAD BEEN REPLACED RIGHT BESIDE THE FUSELAGE FRONT SPAR ASSEMBLY.