You say theres water in the tray under the filter that protects the vacuum blower......ok, so remove the filter and drill 3 or 4 holes in the tray so that any water that collects there can drain away.
Have you made sure the waste tank is not over filling?
Another thing you could try is this.......To test the heat exchanger remove the waste tank lid, run the machine for 5 - 10 minutes......is water still coming out the front exhaust? If no then the vacuum heat exchanger is ok. If yes then its likely the vacuum blower exchanger has burst. This exchanger is like a small radiator, disconnect the 2 hoses from the exchanger and join them together. This will solve the water from exhaust problem. You may be able to get the exchanger repaired at a radiator shop. We ran small Prochem units with this exchanger bypassed for years, yes slightly lower water temps but still usable.
Hope this helps
Richie.