OK, here is the problem. There is water in the feed line, the valve and the line that runs to the water dispenser on the door and the line that runs up the back to the icemaker. If you put compressed air on the RV, you can bleed the line that feeds the reefer and the line that goes to the water dispenser on the door, presumably through the filter. The problem is that the line that goes up the back of the reefer to the ice maker still has water in it as does the solenoid valve that feeds it. The only way to empty that is to cycle the icemaker a few times. Now some vendors give you a complicated procedure to force cycle the icemaker. I would prefer to just let it run overnight and cycle itself a half dozen times. On my cottage Whirlpool one single cycle empties the whole things so 4 or 5 is just to make sure. Much simpler that way. This is the same process as the more complicated one where you disconnect the lines and put compressed air into the reefer while cycling the icemaker.
Then, you can pull the filter and take it inside, close the pop-up that feeds the reefer and pump the pink stuff through the rest of the faucets and traps.