When the water heater bypass valve is in the vertical position like you have it now the heater is NOT bypassed. To bypass the heater turn the valve to the horizontal position.
The tank fill power fresh valve is set for normal flow, this is where it should be for using city water. With water supplied to the inlet turning the valve vertical will allow water to fill the tank.
The winterize valve is set to the off position, this is the normal position. When you set it to the on position the pump will suck antifreeze in through the freeze guard port.
My trailer does not have the red and blue lines, they look to me like they are the low point drains. Look underneath and see if the lines end under the trailer, if they do than they are drains. I would get some silicone sealer and seal around the red and blue lines, there are gaps that can allow insects into the trailer.
Gary
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2019 Laredo 255SRL
2009 GMC Sierra 2500HD Crew Cab
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