a few LEDs are out on Valenti tails - what to do?

It's a 25c per LED fix plus hours of labour. Unfortunately the quality of many of those ebay headlight and taillight assemblies are less than Toyota-quality...

Usually you take it off the car with some bolts, pretty easy to do, maybe 30 minutes if it's your first time ever. Then you bake it in a good oven at a temperature high enough to melt the adhesive sealant but low enough to not deform any of the hard plastic. Good oven because cheap crap ovens you find in kitchens can fluctuate 50F or 100F degrees. A nice electric convection oven will do the job. Then using a flat head screwdriver and some chisels (with oven-gloves on) start prying up the tabs and separating the plastics. You may need to put it back in the oven a few times if you work slowly, you only have about 15-20 seconds after taking it out of the oven to get the pieces apart. After you've separated the pieces let them sit and cool down to room temperature. If you try and take stuff apart before then, you may deform the plastic and it won't go back together properly. After its cool to the touch, unscrew the PCB. Use a solder sucker to get the LEDs out of the subtrate, replace with new LEDs. Then bake it back together. Heat it up in the oven start pushing together, do that a few times. Then reinstall on the vehicle.

 

Nothing easy you can do to fix it. We're in a replace-it world, this is when you buy a whole new pair of lights off eBay and install those.

 

Well you can get "Valenti" lights from eBay that look the same for $250/pair.

Valenti Plug & Play LED Taillights For 10-15 Toyota Prius Hatchback - Clear/Red | eBay

Might be worth it

 

Some generations of Valenti tail lights don’t require baking to disassemble. I got lucky with mine, and had @Dylan Doxey repair some burnt out brake LEDs on the passenger tail. Try removing the tail light and taking it apart first before buying new tail lights.