Congratulations on your new rig!
Sounds like you've taken a good first step having the rig checked out.
We did something similar, but purchased our rig a few years before selling the house and heading off to full time. I tried to do my best to get everything in good working order before leaving, but with any mechanical device, I've continued to tinker with things our first year, including repairing my entry steps because they failed a couple months ago. A very common step brand is Kwikee Steps, and the two most common issues is the motor, or the controller. The motor is usually available at any auto parts store because it's a common window motor. Your tech should know this. Don't know what your mechanical/electrical skills are but you can troubleshoot the problems with this info: https://lci-support-doc.s3.amazonaws...cd_0001628.pdf
Mine turned out to be a bad controller.
You'll find over time things will come up, and repairs will need to be made, but its really no different than owning an older home and a vehicle rolled up in one. One thing you may find if you full time is sometimes things happen at inconvenient times or places. Getting parts can be a challenge in out-of-the-way places so be prepared to be flexible and to roll with what happens. Take advantage of opportunities in timing and location to get things done. I'm currently spending a month in a campground where I can do some regular maintenance and do some upgrades. I've done all my filters, and an oil change a little ahead of schedule because it may be a while before I can do it again. Better early than late. A lot of popular areas with parks have local mobile RV techs, and other places won't even have a service station. Sometimes it's about making due until you can get something fixed and often other fellow Rvers can help.
This is my first diesel and I was somewhat prepared for the sticker shock of maintenance costs and fortunately, I can do a lot of regular maintenance myself - IF - I have a place to do it. Most of these motors are very reliable and will last far longer than their gas brethren, and knowing their model specific quirks can help you. My particular engine doesn't like dirty oil, and has an expensive part that can fail if I push the oil change intervals too far out. Even though failure of that part is rare, I make sure I get regular oil and filter changes. Spending a little extra on more frequent oil changes, can potentially save me thousands in repair costs. That's my engine's quirk.
I suggest you spend a bunch of time in these forums reading anything you can about your coach and it's appliances and running gear. That way if something does happen you may be ahead of the game when it comes to figuring out what to do. Be aware that forum posts are bias toward problems. People rarely post to say that their rig is problem free, a lot of people turn to forums for help with issues which is the cause of the bias. Knowing this will help keep you from getting getting scared reading about all the problems people have.
In a week it'll be a year since we sold the house and hit the road and we love it, I hope you do too.
Welcome to the club!