Jake brake only working in top hole. Cum isx2350 18 speed

[Bluecheese truck driver]

Hello all! I recently had a clutch adjustment done on my 2016 t660 with an isx 2350 and 18 speed eaton. The first thing I noticed after the adjustment was excessive pull when taking off, then I realized my jake brake wasn't working. I went to a different shop and had the clutch adjusted again to what seems like it's original position. The lunging pull at takeoff is gone but now my Jake brake is only working when I'm in the top hole.

The following day, my odometer, trip mileage, and outside temp readings on the dash board went to dash marks then blanked out completely and my fuel economy reading switched from mph to kilometers. I shut the truck down for a few hours and the digital gauges came back on. I manually switched from kilometers back to mph. Could all of these issues stem from the clutch adjustment?

The mechanic told me that I need a new clutch brake.

Thank you all for your time!