Now I could be wrong so I hope if I am then someone will chime in.
I would open the drain and then turn on ice maker. when the solenoid opens for water supply, it should run backwards and gravity should drain it out the blue line.
if not then I would somehow connect a 40 psi air supply and run ice maker and it will blow it out when it cycles.
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2014 29MK
Victron Energy inverter/charger, 1240w solar
550ah LifePo4, Microair Easy Start,RVLocks (keyless)
Airborne Elite Sidewinder pin, Maxx air 7500 Fan
2015 GMC LTZ,6.2 Gas, Short Box, Firestone F3 air ride.
Bilstein Shocks
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