The Tech is correct. The tub or shower pan has a 1 to 1.5 inch lip that comes up behind the wall surround and this is NOT needed to be sealed. But, if I have a Customer that insists he wants it sealed, I seal it. Takes about 5 minutes. A good dealer will have his service dept do this even if the Factory denies(usually they do) warranty for this type problem. Why put up with the complaining for a simple fast repair. Doug
Do NOT use Caulk or silicone for this. It will not adhere. Use DAP adhesive clear sealant.