An annual 30 minute inspection with a square tip driver is a good idea for all rigs, new and used. What is tight one year can get loose another.
We learned that our microwave oven frame screws had come loose. There was some serious rattling going on back there two years ago of which I was able to identify only with my wife driving and me listening around. They looked tight but were very loose. I tightened them and all has been good since.
Don't over-tighten those square-tip wood screws for they will strip. Then you have more work.
Then there are the entry door screws.....their own issue I outlined
HERE some years ago.
Also the B+ front cap had some bad creaking I was able to resolve via the phone doctor Kermit. That involved adding screws.