Okay, so this is probably a long shot, but...
Our Georgetown has developed a leak when the black tank flush is pressurized (the leak is clean water, not black). On this rig, the flush connection is in the wet bay on the driver's side, but evidently the pipe goes to the other (passenger) side, and then up out of sight above the water heater bay. The leak comes down into the water heater bay and then drains out.
I have thought of two possible causes:
1. Possibly the (cheap plastic) vacuum breaker has failed and it is located somewhere up there. Our previous Forest River trailer had that problem when it was very new. I replaced the unit with a better quality brass one.
2. Possibly the flush line retained some fresh water over winter and froze / cracked.
I assume the rig does have a vacuum breaker - does anyone know where it might be located and how I could access it? Based on my initial investigation, getting up into wherever that leak is will be very, very difficult - if not impossible.
Thanks in advance for any suggestions!