Pull the wheel liners and taillights to hose everything down each spring.
while you’re at it you can pull the plugs out of the wheel well and douche it down with fluid film or similar. Do the same to the rockers too.
If you pull one of the existing ones out and look at the back, it should list the mfr model number. They are made by https://www.caplugs.com/plugs
i think it’s their BP series in 13/16. I only needed one so I requested a sample on their website. If you need more, looks like minimum order qty is 200 for $40
Got my hands on a 2019+ fill tube. Based on the fitting, looks like it will be damn near vertical after installation; maybe tilted just a hair forward. Will update photos after install
They’ll do the reprogramming since that is a recall. If the vacuum pump is shot, you wouldn’t be covered unless you can get a goodwill repair. Personally, I think the reprogramming is a temp fix to get people in excess of the extended warranty timeframe — it looks like they’re doing something about it and it’s millions of dollars cheaper than replacing the pump.
Maybe a little and it’s certainly wayyyyy cheaper for GM to try this than replacing pumps. Read the last paragraph of this article.
Check out this article from USA TODAY:
GM issues recall of 3.4 million pickup trucks, SUVs to fix brake problem
https://www.usatoday.com/story/money/cars/2019/09/11/gm-recall-chevrolet-gmc-cadillac-suvs-recalled-brake-issues/2284370001/