Rambo 1.2f PIN 6 won't power off

I can't get my PIN 6 to power down. Doesn't matter how I define the pin, it goes high at 22V+ and doesn't change no matter what I do. I originally used it for FAN_1 but could not vary the speed from full, no matter what I tried.

I then re-wired and made it the extruder fan and set:
#define EXTRUDER_0_AUTO_FAN_PIN 6
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255

When it was PIN 8, it would work properly, not coming on until the extruder reached 50 degrees. Now with PIN 6, it comes on with power and stays full speed.

Any thoughts/ideas on what might be going on?

Thanks in advance,
JIm