Once an engine is has sludge/varnish from poor maintenance there is nothing that can be done to reverse it. Using a high quality synthetic oil will prevent it from getting worse.
The fuel lines require a crows’s foot on a torque wrench to get them tightened to spec. Other than that there’s no special tools. Depending on the price, you may want to change them all while you’re in there so you don’t have to open it up again if another one sticks.
Understand on the poor maintenance and nothing that can be done to reverse it. I was just going by the dealer/Ford recommended oil change interval of 7500 miles. I guess in future if I continue using dealer it might be worth doing an oil change in between dealer change. Or if dealer doesn't use full synthetic oil I could just start doing them myself.
Sounds good on the fuel lines and I have both those tools already as long as I have the right size. I would just need to find torque specs.
At this time I won't be messing with it myself as I called the dealer I purchased truck at to see about the dealer life time power train warranty and how it works. Well they looked up my information and looks like I purchased a Premium Raptor warranty when buying the truck in Dec. 2018 which goes out to 7 yrs or 125K miles. So I will be calling dealer back next week to set up appointment to have them look at and diagnose truck. They said Ford's scheduling system got hacked about 2 weeks ago and it should be upgraded/fixed this week and seems to be a nationwide thing. So I'll call next week and get an appointment scheduled and go from there. Hopefully what they find is covered under warranty or most of it is.
Thanks to your response and
@Old-Raptor-guy responses I at least know or have a good idea of what the issue should/could be. Now I just have to see if dealer can find the same issue.