Yes you can replace the LED's. They sell red LED's at Radioshack, and I am sure other electronics suppliers. The LEDS are grouped into four's. I have typically seen a 4 LED segment go out, one LED in the string is open. So you may have a bad connection on the circiut board. If you have a little electronic know how and good with a soldering iron, this is a straightforward repair. Probably hardest is getting the wing off the trunk due to the double stick tape
. Use strong thread or fishing line to cut the tape
.
Regards,
LarryB