They are probably just fine, about all you can do is turn them on and see if the screens appear normal, maybe if you can hear the transducers “clicking”. I wouldn’t put a lot into actually hearing them “click” because they may be just fine and you just can’t hear them, and it will not indicate that the transducer are 100% ok either, but it’ll tell you the unit is sending the signals to the transducer.
Yeah the 110 went for about $2,000 new (give or take) I know mine sleeps in the bedroom with me all winter, no kidding, I rather not leave it in the cold.
Still I think they will be fine, I had my 337 on my wheeler on some pretty cold days on the ice, it hasn’t seen any ill effects from the sub 25 degrees, not yet anyways
Check out Lowrance’s simulators, you can download a LCX 110 simulator and play with it on your computer, kind of neat I think, otherwise you’ll either not use it to it’s ablilties or spend a lot of time on the water playing with it.