Actually, I have been told that before as well about a tranny on a Chrysler minivan we once owned. They drained the oil and pulled the pan to inspect it and it was showing signs of needing a rebuild but I could not afford it at the time so they put the old oil back in for the same reasons you gave.
I sure hope AAMCO is better where you live because they got $2000 of my money and would not listen to me about problems after the rebuild about my tranny slipping to the point of it being like a "neutral drop" ( or when you rev up the engine in neutral (2-3 second delay) then slam it in drive to break the tires loose. They tried to tell me it was caused by worn u-joints.
I sure hope AAMCO is better where you live because they got $2000 of my money and would not listen to me about problems after the rebuild about my tranny slipping to the point of it being like a "neutral drop" ( or when you rev up the engine in neutral (2-3 second delay) then slam it in drive to break the tires loose. They tried to tell me it was caused by worn u-joints.