I have a 2008 Intrigue with very low hot water pressure, I have taken the cold water connection off of aqua hot as well as hot water return and used compressed air to check for blockage in coil. water passed thru easily. I also used compressed air in domestic feed and seemed to go all the way thru to hot faucets.
My question, ids there a place where all lines go to a manifold of sorts to check for blockage. I do have full hot water flow in the shower.
I had to replace all the cartridges in the fixtures in all my sinks. They can become partially blocked with calcium. Don't know if that's your problem.