Warwick Corvette 5 volume control electronics issue / replacement

Been a lurker for a while, but finally had a question that I could not find using the search, and please let me know if I have put this thread in the wrong location.

I have been having problems with my Warwick Corvette 5 standard with active electronics. I purchased this knowing the problem and since I am pretty good about rewiring guitars I thought it would be a simple swap. Though I am new to warwicks, I assume the push/pull pot control closest to neckshould be volume, with counter-clockwise all the way down and quiet, and full clockwise open and full vol.

Well, the issue is that mid-way through the rotation of the vol, the pot cuts out completely, so there are a few degrees of rotation with no sound at all. Now the strange part is, I get full volume at each extreme of the rotation and the control does not attenuate the signal at all, only full cut out in the middle. I would just assume replace the whole thing and that is what I planned to do when I bought it, but here is the even stranger part to me , the sound is different when the vol control is full up or down, and I like it better with it all the way down. I might be crazy, but I am pretty sure there is difference in tone there.

I have never seen this before on a control pot and was curious if it was attempt at some point with a custom wiring job. It has the same behavior regardless if it is push/pulled in active or passive mode, cut out in the middle with full vol and tonal variation at the extremes of the rotation. Since I like the way it sounds I am almost hesitant to mess with it, though I know I need a functioning vol control, I have been using my vol pedal for now and that might be ok long term. Though being a tinkerer with electronics I am trying to figure out why there would be a tonal difference

Anyone have any wiring diagrams for the corvette 5 standard Active? Just curious if something is really off in there and wanted the opinions of those here on the forum. I am at a loss as to why the sound would change with the vol control, interested to hear if anyone else has experienced that.

Lastly if I do change the pot, are there other alternatives to the $100+ MEC push/pull pots that I see around and? I usually use pots from Stew Mac and they have a 500k push/pull for $9, I have used this before when coil-splitting some other guitars I have worked on..

http://www.stewmac.com/shop/Electronics,_pickups/Potentiometers/Alpha_Push-pull_Pots.html

Thanks in advance for the input, and I apologize for the long winded post.