88 force 125 with bad valve body

I have an 88 Cajun esprit with a force 125 outboard. I was told the valve body was bad and was the reason why the trim won't stay up and slowly creeps down. I have found this on eBay and was wondering if switching the pump with it would resolve the issue. http://m.ebay.com/itm/290537568485?_mwBanner=1

I heard you could rebuild the valve body but I am not a mechanic and don't want to risk making things worse and have found no further info on it. Anyone have any ideas?

I believe this is the same part. http://m.ebay.com/itm/171347425511?nav=SEARCH

Either one will work. Just know that both are probably made in China and won't last as long as a US made one.

Get one with a good guarantee.

Before you just replace the part, test it for leak down.

It's possible the tilt ram cylinder is leaking and the pump is ok.
You have the manual?

I can try to get the instruction on how to test.

I am willing to try anything. It lifts fine just slowly goes down, making solo launch dang near impossible. I really don't want to put a lot of cash into it since I plan on getting a boat that can handle big river(st louis Mississippi) and low water(I can't do much low water do to the trim issue. I don't have the manual but I do have a oring kit for the hydrolics but unsure if I wound be able to do it w'o a mechanic's help. I would greatly appreciate any testing tips. I am new to owning a boat still.

If all else fail and I do need to replace the pump how hard is it to do? The metal hose lines make me nervous, lol.

The change isn't that hard.
The fitting can be a B
Spray with WD-40 or PB Blaster
I also use a small propane torch to heat the fittings.
Your gonna replace the pump anyway so the heat won't hurt.

What sort of test do I need to do to rule out the ram cylinder?

Hope you can understand. You'll need to buy a 3/16 inverted flare(female) and a 1/8in. plug for that. And a 3/16" inverted flare lug male.
The pics look blurry until you open them.

Thanks for the help, I gott go help spot a buddy who is doing his boat's first on water check since bought/repaired. I'll h to figure out where to buy the plugs then get to checking it soon.

Home depot or any hardware should have or anyone selling brake lines.