Red & Blue
On my 337FLS those two are from the water heater. If you want to clear the system there are several great videos to guide you through. If there aren't any leaks and the caps are intact you are good to go.
I got caught with the sudden artic freeze in MN; since the temp went up over the weekend I was able to winterize totally. I used the compressed air blowout. Everything went well. That's how I'm so totally up on the silly little tubes. I played with them all.
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