In residential, the "have the customer sign" routine has turned into a de facto sales ploy. It adds pressure to an already unsure and nervous customer. I'm not suggesting at all that you had any such intent Bob. And indeed it is better to fix leaks. Not offering a leak repair as some guys do is not good either. But the customer is under no obligation to do so and we shouldn't force it or ask them to sign anything.
The waiver routine may have been well intended when these regs came out years ago. There was a lot of uncertainty back then. But now the dust has settled and the law on this matter is clear.