MT RR DW Door Seal
This is one of those interesting problems where there is more than one solution, yes replacing the seal will probably stop the leak as will a 30 second adjustment of the door strike. But unless the seal LOOKS bad I have always been able to easily fix the leaks without replacing the seal, this should be especially true on a lightly used machine like yours, and there is always nothing to lose in trying an adjustment first. And even though replacing the seal isn't a really difficult repair anytime you disassemble something old you run a much greater risk of creating other problems.