1. Could I do a lot of harm disconnecting the relay? 2. Could the relay itself be failing?
While you're at it, pick up a few extra relays to carry in your parts bin. I'll bet you have quite a few of them scattered around your coach, and it is not uncommon for them to...
I have to say- reading the electric wiring diagrams is challenging.
Will be interesting to see if the new one stops the clicking noise, or if the problem is elsewhere causing the relay to click. I have checked the switches and they do not appear stuck.