Welcome aboard, Mike! You'll find a lot of great info on the H-34, and folks here on this site!
Have ya changed the gasket on the portlight; the little gasket that the movable "glass" seals against when the port is closed and dogged? You can try some silicone grease rubbed into the rubber gasket.. may stop the leak temporarily.. long enough to get some new rubber and change it out. This site has a good price on the rubber stock.