Tranny failsafe prog

I posed earlier about what was going on with my 98 540I and took it to a mechanic to do an inspection, and he called me back and told me I have forward clutch drum damage. Code p0720 & p0731. He said he would need me to do a rebuild and estimated it at $2800. Should I do this or should a try an find anther and have that installed?

My mistake, wrong forum.