Hello, I've been looking for guidance on how to deal with a possessed fridge. It's a 30 year old Dometic 2807. Works great, at least at the time of this writing. In the past month it started making a ticking sound every time the boiler cycles. From what I've read this can be an untoward side effect of internal corrosion in an old boiler. The weird thing is, when it started up I lightly tapped the boiler with a hammer (emphasis on lightly) and the ticking goes away for 5-10 seconds, then comes back. Any ideas what is actually happening?? Is it worth trying to fix?? Any insights would be much appreciated...the unintentional 3am ghost-boiler alarm clock is not my favorite