Trying to help my Dad

I originally posted this on Reddit but someone there suggested I try here for better luck for information.
Anyway here goes:

My dad recently had a new transmission put into his truck in TX and paid $7000 for the work in total.

The transmission failed two weeks later. He was stuck in Missouri when it happened, so he took it to the closest shop he could.

The new mech guy in Missouri tells my Dad that it was the new transmission because his hoses were bad and that the old mechanic should have been able to see that, *and* that new hoses should have been included with the transmission costs in the first place, *and* that he *should* be able to contact TX guy and have it fixed under a warranty.

That has not been the case. TX guy said that because MO guy worked on his truck he's out of luck and voided his own warranty.

None of this seems right to me. My dad is an owner-operator, he likes to keep his runs few as possible to free up his schedule and so he doesn't have a lot of money or the ability to afford new transmissions every other week. He's scrounging up the money trying to pay another $5k for another new transmission

I feel like there's some sort of issue here. No work has actually been done to the truck yet, but I gave my dad $3k to help get another new transmission.

Any advice would be greatly appreciated.

 

The hoses that connect to the transmission apparently. He drives a 2012 Volvo 670, if that helps..

Update:
I've had time to talk with my dad some more about it and he says that there was actually a third stop.

After Texas, he got a message that he was low on transmission fluid while in Illinois. It was in IL that he had his transmission fluid refilled.

MO guy said that his 'fluid cap' was "hand-loose" on top of the bad hoses. The hoses still needed to be replaced.

This is where the issue is coming from with the TX guy. Does that change anything?

 

If that's really what we need I guess I'm #### out of luck. My parents aren't the lawsuit type.

But I do think you're right.