i have a 2003 330 Express. Factory used the Pro-Blaster 2088's for both washdown and fresh water, adding an accumulator tank to the freshwater system. You can find the manufacture date at the bottom right of the pump (can't quite make yours out).
I just changed my 2003 pumps out yesterday with new pumps. The original pumps were still working fine, but I thought 20 years was good enough
. The freshwater Shurflo Aqua King pump now does not require an accumulator.
Looks like your Bennett trim tab pump is OK on fluid - wipe the front side clean and you'll see a fluid level mark on the front. Uses regular automotive ATF fluid to fill. Plenty of info on YouTube about servicing the system.