Synergistic LED's How long do they last ???

May I suggest simply phoning SR and explain your request to Eliott. They'll possibly sell you a pack of LED's at cost + a few bucks shipping. You may even get the OEM heat shrink too. However they'll not likely honor any existing warranties if you do a DIY repair.
These guys are among the best in the business to deal with in my experiences, very accomodating. Meeting Ted personally at Mike Holm's shop, when he demo'd his new Teslas, was an enjoyably memorable occasion indeed.

I have contacted them, although not by phone. Synergistic certainly knows of my request. I suppose I'll just continue to take my chances. But I'm as likely to send the cables in for this simple repair as I am to ship a Ford back to Detroit for a new headlight.

Der,
As you have already discovered replacing the LED’s is not a simple task. In your first post you state you already rebuilt the Active Shielding using red LED's. Then when I posted my response you seemed to recant from your original post implying the work was yet to be performed (at least this is how I read your first two posts).

I am not certain what is not being disclosed in your post but we would love to take a look at your cable and figure out why you had two LED’s go out on one cable. This is as rare as finding twenty-dollar bills on a busy sidewalk- it happens but not very often. In fact I just checked the company database and we had less then 20 such repairs for all of last year and none had more then one burned out cable so something is up. I suggest you call the factory on Monday and get an RMA. Let us have a look at your cable (and power supply) and we should be able to correct your problem same day and get your cable back to you right away.

Yours in music,
Ted Denney III
Lead Designer, Synergistic Research Inc.

NOW- That's what I'd call a very personal commitment to customer satisfaction. Another reason to love their products(aside from the excellent musical reproduction).

Ted, I sure did not intend to racant anything. To be clear, I did replace the dead LEDs with red ones, as I said. My insistence on doing it myself with the correct LED refers to doing it a second time, this time with the OEM LED. I found the task to be very simple

If something is up with my gear, it is likely a problem with something other than the speaker cables, as the LEDS burned out in two cables, both times upon plugging them in after relocating things. I replaced the upstream mini-plug connector that was involved in both LED burn-outs, and also an MPC burn-out, as it turns out, and all seems to be in order now. I don't expect the red LEDs to last as long as blue ones, though, because the reds are relatively low intensity, low current, and low voltage compared to blue LEDs, and I left the original resisitor in place.

I prefer to be taught how to fish, as opposed to being given a fish.