Help: Need the schematic for Stingray 5 H with phantom coil

The previous owner installed OBP-3 (which I like it, so I think I will keep it). Problem is; I got severe noises in the middle (one coil + phantom) and Series positions. I sent it to a nearby workshop to adjust the action and add a passive switch, and I’m happy with everything except it’s still very noisy, however he said this is normal for Stingray. Another technician said it’s impossible to have the pickup operate correctly using the existing selector (non-original) and I need a “12-pole super switch”, he refused to fix it because he said it’s very difficult.

My plan is, I will get back to the first technician, show him the part number of the correct selector and correct wiring diagram to make the pickup work as it should be. Anyone can help with that? The rest electronics is already good.

I have searched every where already, and the best thing I got was the link to a PDF which is already broken :confused:

Another request is the serial number is already gone. One inside the neck pocket is also removed. I strongly believe that it’s a genuine Music Man because the body wood is of high quality and seems to be single-piece (if this is joined then it’s the best joining/matching work I’ve ever seen), but it will be great if you can help me confirm this from these photos:

Thank you in advance!!

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