Hi Vern- the topside itself if the screen is black and you do see condensation there it may be the screen has taken some water damage and does need to be replaced. We did discontinue both of the designs of the part numbers you mention and the topside X310334 and overlay X509123 are the are the needed parts to replace- the computer is the same the design is different. Keep in mind if you are under warranty for your spa- or part warranty ( Balboa- the maker of your topside controller ensures a year as long as you have a receipt for the controller purchased) you should be able to claim a replacement with the servicer or place you did business with if that aids you at all. You can always call 1-800-860-7727 for any help you may need in finding this information or tech support!