Help! Y-Axis not homing

Hello,

I have been tinkering with the z-limit switch (probing) and when going back to original TAZ 4 firmware, the y axis will now not home and moves in the opposite direction; while the x and z home fine

I inverted the logic of the y axis and it changed the direction, but still does not move toward the limit switch, only a mm or so.

Any ideas?

Thanks,
MM