That's correct. After 50 to 70 hours we removed them from the airframes and tossed them in the dumpster. The cost of returning them, having them rebuilt, and re-shipped back to us exceeded the cost of a new engine. Since we went through a lot of engines, it was more cost effective to junk them. The work involved in re-working them, plus the paperwork involved in shipping a used engine from a foreing locale, made hanging on to one for yourself not worth the effort.