Part #66310-E4600 is where the air intake for the HVAC fan is located. The fan is bolted to the underside of this cowl over the intake opening. This intake is a sheetmetal rounded rectangular duct with a flange that is welded to the cowl. I have rust around the flange of this intake that is allowing water to leak onto the passenger floor area. This intake is covered by a shroud on the Cowl - Top outer (66300-E4600) that keeps rain from entering this intake. It appears to me the only way to acces