bm23 beverage air too cold

purchased a used stainless steel BM23 kegerator and it’s very clean… powered it up and it works nice… a little too good. I cleaned the inside and out…

I put a keg full of h2o and a 5 gallon bucked inside to test the temp, and at the coolest setting, ice starts forming… when I moved the switch to 1 and let it run overnight, the temp of the water in the 5 gallon bucket was just above 32 deg F… a bit too cold!!! Manual says to ‘reset the temp control’.

I’ve taked the inside top part apart to get to the fan and controller, but don’t see a reset button? pull out the temp probe and sand it down?? replace it? need help! thanks.