I pulled the cowl intake grill off and plastic tray out because there was some of that fiber glass window screen that someone tried to attach to the tray where it dumps air into the heater. It didn't look stock nor was it well-attached. Once the tray was out I could get a good view of the tops of the cabin fresh air regulators. Just inboard of each regulator there is a "pile" of some sort of dumb-dumb that forms a sort of "dam", I guess to keep trapped water from spilling down through the fresh air registers when turning a corner. These dams are about an inch tall (guess). I could see where the PO had added some of his favorite red RTV goop to one of the dams.

Both cowl drains are open and I'm putting new hoses on them.

Questions:

1.) Are those dams OE and are they necessary?
2.) Is there supposed to be some sort of screen other than the one already built into the intake grill?
3.) Are there replaceable seals on the fresh air regulators and is it standard operating procedure to replace them?