I too find the word "Lug" in the context of this post makes no sense.
As to the A/C.. had that kind of problem when this coach was new.
Led me to make the following joke: Many RVers have a few screws loose.
Now, which screws am I talking about? I decided to start my trouble shooting at the main power distribution panel (Breaker box) Noticed wires moved fairly easily in some of the breakers.. Grabbed the #2 Square bit and started tightening screws.. One took over two full turns before it started to offer resistance,,,, Nearly 3 full turns to tight.
And you thought I meant the kind of screws you DON'T use a screwdriver on.