No, adjust the existing one.

The door may have been forced open further than usual, taking it out of adjustment. They normally have 2 adjustments. One is closing speed, and the other is the latch. Sometimes both are adjusted by the same screw, (hydraulic) where a quarter turn adjusts the latch and a full turn adjusts the speed.

The "tube" they are referencing is inside the top of the door, where it connects to the door itself. It likely has small adjustment screws you can reach from the top. It might even show a name of the closer model.

Just using normal physics. You can't add cold, you can only remove heat. Exhaust fans work with this principle and not against it.

Reach in there and lift the float manually. If the water does not shut off then the fill valve is bad. If it does shut off when you lift it then it's just a matter of adjusting it.

Here's a ghetto method: run it tight along the long wall and put a brick on each end to keep it tight.

Or, get a needle and thread, loop it around the ethernet and sew it with a couple threads to the carpet to keep it from moving. Easily removable and no marks are left. (nevermind if there's no carpet)

Or just put the fan further away from it with kite string connected to the housing so it pulls back the chair when it turns.

To me they look like normal "hills and valleys", or ripples. You have to sand the hills down to the valleys to even it out. Test it out by running a pencil line perpendicular to the "lines", then sand again and see if the valleys still show the pencil mark.

Put a thick screwdriver or metal bar under the door (on the latch side) and attempt to close the door on it. Lift up on the bar as you do it. Each time you force it will raise it up slightly. Basically prying the latch side up. Use sudden movements, not slow and gentle.

It's either that or lower the strike plate.

Sometimes they don't bury the cable right away. Usually due to winter conditions where the ground is frozen. Also, the techs can do hookups but burying the cable is manual labor so they would refer it to lower paid workers at a later date. But it's good you became a squeaky wheel because sometimes they don't follow up with the burial.