Roger that... on the labels issue! It's like a treasure hunt finding the right combo of "stuff"!
The Red and Blue are your low point drains. If they're the typical arrangement, when the "T" or ( "L" handle) is at right angles to the standing part of the fitting when the valve is closed. You will also find another hose sticking down, probably white or grey, that is your fresh water tank drain. It may have a spigot, or just a screw cap. As far as the other valves, on our rig, the by-pass valves are up and down for summer, and horizontal for winter. I hope this helps.
You will need to determine if the leak is at the "spigot", or before it. Don't be afraid to experiment, but it would probably be a good idea to turn off the hot water, for your safety, as well as to keep the tank from accidently draining, and causing damage. It may be a simple clamp type fix.
Good Luck,
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Pull Toy
Steve & Jan, Ava & Emma (Mini Schnauzers):
2016 F350 Lariat 4X4 Powerstroke CC/SB "PULLTOY V"
2013 Alpine 3535RE "MAGIC CARPET IV"
Proud Navy Vet!
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