This year was my first full season of trapping in PA with new MB-550's that I dyed and dipped in Full Metal Jacket before the season.
Should I expect to need to do any special maintenance on them after just 1 year of use (besides cleaning, redying, and redipping)?
The traps looks good to me and all functioning well, but I'm new to this and I don't want to miss any important details.
Thank you in advance.

I always make sure the pan sits level and pan pressure is right. Make sure traps are still tagged (if applicable) I also check swivels and j hooks. If you reuse cable anchors they also need inspection

First & foremost for me ^^^^^, I never took anything for granted. Every trap, every year!

If you didn’t make a catch, they should be good to go. FMJ is GOOD stuff and I often get years between recoating them. But, if you see signs of rust, it might be worth your while to strip and do them again. I don’t know if you are dealing with acidic soils or what your situation is, so check them over, get the big chunks of dirt off, pull out the grass stuck between the jaws, and box them up for next season.

Unless you're seeing rusting popup with FMJ'd traps, no reason to redo them. Spray em off and hang is all you need to do on them.

At the end of season every trap gets pressure washed and inspected. From the anchor to setting the pan, I inspect each one. If they need repairs they get fixed right then and there. If traps need touch up on finish and waxing it get done right after the inspection. My predator traps go into totes. Each tote has pine needles, oak leaves and grass. Water traps are either hung up or placed in milk crates. I do the same routine for my body grips. It takes a couple of days, but when I'm finish they are ready to start the next season.