Everything you ever wanted to know about LEDs
On my quest for the repair of my PS1400 LEDs, here's what I've learned.
The LED assembly used in the PS1400 appears to have been special made for JBL. The good news is that it was also used in the S120PII sub. The LED itself is an easier thing to find. The part number for the individual LED is L-117EGW and is made by "Kingbright". I'm working on getting some, but it may be easier to buy 1000 than to buy one or 10.
Of interest: You can get the same LED in different colors! Red/Green = L-117EGW, Red/Yellow = L-117EYW, Green/Yellow = L-117GYW. As far as I can tell, they glow one color with forward current and the other color with reverse current.