I have one LED set of one string that sometimes does not light red.
All other colors on that LED set work fine.
By pressing on the middle square LED, it will stay "fixed" for many days.
Then after a drive, the next time I use it it will be "broken" again.
It is a cold solder joint in that LED. It will be a PITA to fix (CAREFULLY cut through the rubber covering so as not to sever anything that could knock out the entire string down stream; Find the cold solder joint and re-solder it without melting or destroying the rest of the circuit; RTV the repair so it won't corrode or block the lights I just fixed.
So, since it is only one (it IS in the middle so I can't trim it out), I plan on living with it till I can't anymore. Then I plan to use an "off cut" to patch it in with some small hookup wire.
I am sure if I notify the sender he would make "good" with a new string, I just have not done so.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW