Leaking From Drain Valve Help

[YoshiMoshi]

I have a Hot Spring Spa, Prodigy, Model H, Serial Number H3E1249. It appears to be leaking from somewhere behind the drain valve. It looks similar to this.

My particular spa has one drain at the lowest part of the tub. There are two drains on my spa, located underneath the maintenance panel. One has a lever on the valve body, while the other does not. The one with the lever, somewhere behind it is leaking. Any tips on how to fix the leak?

I looked online for example:

https://www.hottubspasupplies.com/catalog/product/view/id/2022/s/hot-spring-spas-30592-drain-valve-hose-shut-off/category/2/

To see if I could find a diagram for my spa of this part and what it is connected to. Under specifications, none of the diagrams seem to match my spa. But this is my closest one.

Part 10 and 11, I'm not able to locate on my spa.

Because it seems to be leaking from behind the vale, I think the valve is closing properly. Anyways, I was thinking of untwisting the drain valve with the handle from the tube adapter, putting new tape around it and seeing if that helps. The valve itself seems already pretty tight. I'm not able to loosen it or tighten it by hand. There are wrench flats on it, but I'm not sure what size socket I need. I would assume some sort of special one, with a cut out for the handle. Not sure where to get such a socket, but I presume it would be a specialty one.

It's in a recessed cutout at the bottom of the spa, so channel lock pliers would not help, not enough clearance. The only thing I could think of is a socket. If successful in removing the valve (if I ever find the right tool), I would be unsure how much torque to tighten the thing back down in place with. Anyone know? I would use a torque wrench.

If retaping the valve does not work, then I would presume it's leaking from somewhere else, further back. How do I troubleshoot or investigate further to attempt to fix this issue? How would I access the rest of the parts in the drain system to look for where it's leaking? I'm learning to be a mechanic, so jack stands, floor jacks, wrenches, so forth I have plenty. Not sure if I would have to access the rest of the drain system from beneath the spa? If so, I wouldn't be sure how to safely jack and support the spa in the air safely.

Thanks for any help or tips on how to fix a leaking spa that is leaking in the drain system somewhere.

Also, I might add, that this spa hasn't been used for awhile, and it came with our house when we bought it, so the history is unknown to us. However, it's an indoor spa. I do live in an area that gets below freezing typically in the winter. It sits in a room with no heat, however there's heat inside of the house that the room is in that presumably was always heated, because people were living in it, so I doubt anything could have frozen causing damage. 

[YoshiMoshi]

BUMP

[RDspaguy]

I'll tell you the same thing here as there buddy. If you need to hear it from someone else @CanadianSpaTech will tell you the same thing I did.

[CanadianSpaTech]

What he said