crwdns2935425:02crwdne2935425:0
crwdns2931653:02crwdne2931653:0
Difficult method
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Previously I have suggested finding a known good LED from a section that works, and using it to replace each LED in the bad section, one by one, to see if it lights up, thus identifying the bad one. This only works if one and only one LED is bad, however. And it's tedious.
crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0