I've stayed in touch with Matt (curtisfarmer) the prior owner. He wanted to grab a new non-teir-4
M7040 before they became unavailable so he was motivated to bale on the
L48. We agreed on a price that assumed the tractor had to come apart for a new HST. But our understanding from the beginning was if it was cheaper to fix, we'd share in the good outcome somehow. It will possibly sell well above our number - if so we'll split the margin or something.
It's tempting to find fault with the factory or the dealers for the relatively thin product support available for the larger HST units. The very low incidence of failures means an absence of service experience. Dealer shops need to generate income so they pick conservative (for them) solutions - like whole component replacement. Unfortunately the customer's checkbook takes the hit unless another solution turns up. The dealer would have looked pretty bad if he had first said he could fix it for $200, only to call back and say it would be $9,800 instead.