Low point drain just started leaking out of the blue?

Here is the story, I've been camping for the past two weekends the first weekend was fine no water leaking at all. That following Monday the camper went into the shop to get the outdoor speaker fixed and a new water heater element because this dummy burnt the first one up. So I went camping this weekend and the hot water low point was high but spraying water. So Teflon tape latter if has a drip and it's the best I could get it. I call the dealership this morning and they swear up and down they didn't touch it. I told him what is was doing and he said well that sounds like its cross treaded. I told them I never touched it and he told me they sometimes take a while to start leaking? Really come one now. It's like a 5 dollar fix so why don't they just own up to it.