Welcome to the forum from just east of Toronto!
The washer should drain into a tank. Which tank depends on how the factory decided to plumb it. It could be the grey tank or the black tank. Originally, the 5er should have had a separate gate valve for each tank. I have to assume (hope) that the previous owner replaced each valve with an electric valve but that could be wrong. There may be a separate, add-on valve at the outlet of the 3" pipe where the black and grey tanks drain.
The galley tank is typically only for the kitchen sink.
Hope this helps some.
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2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed
2019 Rockwood Signature 8290BS (2019 - 2022)
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)
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