I just had similar experience yesterday with my "new" Freedom Elite 22FE. Took out of garage after ownership about a week and tested all the systems before using for a trip. Filled fresh water tank, ran all systems, filled black and grey tanks with clean water about half full. With valves closed noticed a steady drip from grey water discharge line in front driveway. Made note to have repaired under warranty next week. Drained all holding tanks in driveway that has very slight slope to street and let them drain for quite some time. Backed back into garage on flat garage floor. Went out about 2 hours later walking around rig in back noticed a large puddle that just had reached my large gun safe in back of garage. Drained all out what was in line on flat garage surface into bucket, about 2 gallons. If I would not have checked this, water would have run underneath gun safe and over night could have caused some very expensive damage. Safe is very large about 1k lbs. and sits on top of rubber vinyl vapor barrier but still could have caused some amounts moisture to wick into safe where I have several very valuable antique and modern firearms. Even after this is repaired, I will never park in garage with "any" water in any of the holding tanks. May eventually move safe but this will take a professional mover to move into another garage area. Also have apartment built to rear of garage where my safe backs the wall and if enough water was to leak from any of the tanks, even with safe removed, water would wick under the wall into guest unit.
Looking closely and shaking ABS drain line, it appears it is completely loose and never was glued in place. So much for the PDI that was suppose to be done before I picked it up.
Lesson learned: If you store inside, beware of possible consequences of a possible leak that can or may happen anytime due to vibration or physical road damage.
I do consider myself very lucky as this could have caused some very serious damage and loss to a very valuable antique firearms and irreplaceable collection that even insurance could not have compensated.