72 Thinline Neck P/U Problem

Guys,

Swapped out the 250k pots in my MIM 72 thinline with 500k pots.

Wired everything up correctly, even followed the Fender Schematic.

Now my Neck P/U is dead, but Bridge P/U is strong.

Vol & Tone work on Bridge P/U.

What have I done?!?

Cold solder joint? Grounding out?

Please help, if you can.

Did you change *anything* other than a straight swap of the volume pot?