Yes, private equity needs to be shut down because, I don't know, some American city refuses to do maintenance on their trucks or something. Surely private equity is to blame.
The solution to cities not doing maintenance for whatever reason is not to gather all the companies together that provided a service under a single banner and then allow them to price gouge. Especially not when that service is required for the fire dept.
In my city the maintenance is done by the fire department, not in the US though.
Also fire truck repair is much more amenable to competition (the article points out how fragmented and competitive the market for the trucks themselves already is), this is just truck maintenance there are small to large shops for this around the entire US. Especially since the trucks themselves likely are generic and not fire specific.
This is entirely on the city, blaming some other boogeyman for this is absurd. Sure, you hate private equity, but they aren't some menacing ghost causing everything bad in the world.