I am defrosting it right now and we will see what happens.
What'll happen is that the box will cool properly for a few days and then warm up again unless the defrost problem is fixed.
Easy test is to manually force defrost and listen for the snap, crackle, pop of condensate dripping off onto the heating element after a few minutes. Listen carefully, freezer door open. If nothing, then check to see if you're getting 120vac from the brown wire on the ADC board to neutral. If yes, and the defrost heater isn't firing up, then the defrost thermostat may be open (most common) or the defrost heater is open (uncommon).
If you're getting voltage at the ADC and the defrost heater is heating, then replace the ADC board because it's failing to initiate defrost.