[hypoxia]

So the transmission had to be replaced?

Yes, that's the general consensus.  We could have chosen to take it out, tear it apart & try to repair it locally but the savings would be minimal & the risk moderate considering where all of that debris may have gone.  We would also be here a few days more in a hotel. The transmission itself which was rebuilt by Allison is $8345.07 + labor, fluid, taxes, etc. and has a 2 year warranty.

Interestingly enough my last coach had the same Allison 4000 which was replaced at about 45,000 miles by a previous owner.  The Weller Reman replacement was good when I sold it at 110,000 miles.