It's a Throttle Body that's for the engine in the Dodge Viper car, it's a little bit larger then the Factory JK's one.
There's lots of info on it in the other JK Forums.
I put a Viper TB on and then 2 times after that I got the lightening bolt. I searched for a fix and found the TB reset and after doing it the 2nd time it worked and that was about 6 years ago.
That seal leaking slightly won't cause that noise, did anyone check the oil level?
Bumps causing the noise and vibration would be shocks, wheel unit bearings, skid plates.
I didn't know that the 2017 heater hoses were gold plated, I don't have a JK that new to know what they look like but you need to find another Mechanic I think.