As soon as water gets into high voltage electric circuit, electrolysis happens.Depends on polarity of electricity c osit of metals or metal oxides.Loosing exposed printed circuit board trace is hard to repair because it requires extremely careful examination of any exposed current conducting parts or PCB traces.
If the equipment is still worth the trouble, you can do what I am going to about this Mark Levinson No 331. Mark Levinson No 334 Repair Torrent Mac HerePropellerhead Recycle 2.2 Torrent Mac here. Amp had extensive water damage inside as if it was sitting in the water for at least few days while electricity is flowing. I had more than few bad shaped amp for repair, this amp was new record low for its condition. I had white powders every where and few parts on the control board was missing ( electrolysis corroded aluminum, zinc and copper if the part has live electric current flowing. Most damage was done on control board because it has always on supervisory power. Disassemble Mark Levinson No331 down to last screws and bolts. Ply wood panel to cover the floors from getting marred by flipping amp around. Loosing exposed printed circuit board trace is hard to repair because it requires extremely. First open up the top case by loosening screws( 2 screws with black plastic washers) on the back. Remove small screws on the heat sink cover that covers output transistors on the both sides (4 pcs) Remove all screws on the top side of heat sinks on both channel to remove top rails that hold cover Remove screws on balanced input connectors ( mic connectors) to get ready for desoldering the part form voltage gain boards ( a board at the top with RCA plug). Remove 2 top screws hat hold amp face plate ( thumb screws ) from inside.
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