Unless the daughter is a dozer mechanic, it seems this is still applicable.
She is the owner of a heavy equipment repair shop. They have mechanics.
This just isn't going to turn out well for anybody.
I'm curious as to why she said they can't finish the work. I don't think it will make any difference but it just seems an odd situation where she initially agreed and then backed out.
and $1500 per week? like in 40 hours? That's $37.50/hour shop rate. Wow is that cheap, at least compared to rates in my area.
how were you going to get these units to wherever?
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this is how I see it.
you get your new parts back, no question,
you owe the labor tab up to date
she owes you the cost above and beyond what it would cost to transport the units after the work was done since that was a cost you had to incur anyway. Your bargain would have put you in the position of being able to drive one unit onto a truck and transport the other unit, most likely as parts (so you would have had to obtain some equipment anyway). In reality, I don't see too much of an additional cost to you to transport the equipment as it is than if the work was completed.
where are you at a financial point with that?
then figure in the cost of a lawyer (non-recoverable), the delay in getting the equipment repaired, and the stated desire to not injure the family (and I suspect a bit of goodwill is in there somewhere).
Where are you now?