I was changing out bulbs yesterday in the backbox of my farfalla & noticed when I shut it that the 3rd digit of one of my score displays was totally out. Not dim but just completely blank, the displays are otherwise solid & perfect on this game. Solder joints are all good on the connector. on the board side of things & not sure if I can repair from under the glass & since I was opening & closing the door, I do worry that something could have cracked inside? Could a component have gone bad? Transistors seem to test ok. Would appreciate any help. Thanks!

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Never did anything like that before. Where could I get just the replacement glass? & a guide on how to replace it?