Want position 3 to be series not parallel

Hi All. Just added a Koa BFR Luke 3 HH to my guitar closet. I want the position 3 switch to make the 2 HB pickups in series not parallel. There are enough parallel sounds with positions 2 and 4. Does anyone know how to rewire to put the 2 HB in series?

I’m curious about the 5 pots inside the guitar. I’ve read online that 2 are for boost (more than 12dB?) and mix and the other 3 don’t affect the sound. I’ve emailed Ernie Ball asking for details. Does anyone already know?

Thanks and happy playing ! I’m celebrating 50 years of performing this year. Can’t imagine my life without the gift of being able to play guitar.