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I would go get a new invoice and sell her a 30lb drum if that what she wants.lol
I would say to her it must be your lucky day.I would explain to her that freezone does not wear out, it leaks out.Then I asked them did you ever need freon put into your
refrigerator? They always reply no.
I then will say how long it been since you last had freon put in,They will say last year about this time.I then say where it must be a small leak if its a leak at all.
I will then say if it stop cooling this summer give me a call and I will come out and see if its low.If it is we can discuss the price on doing a leak search.
If I do not hear from you I'll assume all is well.
Collect for my service ticket and get down the road.