I am not very familiar with 240 body part terminology, so I'll try to describe adequately. There are several open holes on the raised rectangular tubes running longitudinally along the underside of the floor pan. Are these holes(approximately 1/2 inch diameter) supposed to be open(for drainage?) or should they have a plug in them? These are not the larger floor pan holes with the rubber plugs that are on the flat surface of the floor pan. Thanks, Victor.

Yes, They should be open to allow for drainage of any water that gets into those "rails".

Thanks, Victor.