How high is "high". With the compressor off, the static pressure should be around 70 to 90 psi on both high-side and low-side ports. It's unusual to have both TXVs go bad at the same time. Sounds like a compressor failure to me.
Replacing the TXV will require a complete depressurization of the system, then the repair, then pull a vacuum and refill with refrigerant. If you don't have a recovery machine, vacuum, and gauge set, this is probably beyond your scope. Although, until I got a recovery machine this year, I'd pay a shop to recover my refrigerant then take it home and DIY the repair. I already had a vacuum and gauge set.
If you have a dual zone AC system (front and rear, which you likely do. I'm not familiar with the 2016's), then there are two TXVs. This part Spring, my compressor went out on my '07. I used the opportunity to replace the condenser, drier/receiver, and both TXVs. I also flushed all of the lines with HVAC cleaner and replaced all seals and o-rings with new ones.
