Quoted from lyonsden:Similar problem came up in this thread: https://pinside.com/pinball/forum/topic/tspp-leds-on-mode-sign-are-acting-up
The short of it:
-The flickering (in that case) looked like strobing of the lamp matrix
-One of the LEDs was the problem. Once it was removed, the problem went away.
-A replacement LED has been ordered (VQA29 Miniature LED TRIANGULAR GREEN). Hopefully that will work as a replacement.
Is there a website you know that sells this replacement LED? I bought one online and it is the right size but after replacing it the LED stays lit all the time.