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I'd replace the LCD, which is a KT LCD3 unit commonly sold on ebay for about $40, Problem is some of the early Sondors units, maybe all of them, used special firmware so you had to buy their model for more money. The above forum will sort you out.
I recently had the first digit of temperature display start going on/off on one of my LCD3's. Just an irritant. Figured it was a bad contact. A little later, the display spontaneously cracked. I had to buy a new one, but mine was just a generic model, 38 bucks on ebay.