Hello from Brisbane.
Rusty door tops are common because water and crud builds up under the felt slide rails - the three holes are meant to be drain holes but may well be blocked. So, the water really didn't get in through there unless it was going the wrong way.
Depending on how bad the rust is you may be better seeking out replacement tops from a wreck or Rocky Mountain tops if you are feeling rich - they are aluminium and have both panes free to slide giving better airflow.
Cheers,


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