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.

Take a good look at the coils to see it dirt/mud got packed in them around the rods that hold the coils. Lots of clay in my area and on a damp day a coyote can have those coils plugged full of mud. I always check those areas and hit them with the pressure washer when I'm cleaning traps prior to dye and wax. I don't like the thought of that mud staying in there, drying out and then absorbing ambient moisture while being stored.

I give every trap a once over, setting and firing, chains & cables etc. I find my 330's need the most attention as they're in use year round. I also find different water systems are harder on the steel than others. My good well tuned 120-180s get cleaned and waxed, my 330's don't get the wax dunk. The wax stays on pretty good depending on the action the trap sees, some will get another dunk this spring. A bit of FMJ to brush up any kill bars that may have the wax rubbed off. FMJ is pretty good and tough, but after I tried waxing my little 120s this fall, there's no comparison to the speed and smoothness when the trap fires.......but it's imperative that it's waxed properly. There should be good info in the archives on this. The trap has to be perfectly tuned for wax too, or you'll wind up with sore fingers or empty snapped traps, triggers gotta be solid yet ready to fire.

i usually give my traps a good wash in the spring with the pressure washer and repair any that need repair any that need it (bent dogs or pans) than in the fall time i worry about pan tensions just before i boil and dip them