First off to both of you, why don't you fill out your profile, with your YMM, and I can tell CBR's next question is going to be "I DON'T KNOW WHAT YMM IS?", just like when Skelley asked for MY. Why do you ask, several posts in this thread and I'd bet 5-10% of all posts in the entire ROC, revolve around attempting to determine, "where" someone is coming from, thank you Skelley for atleast providing "WV", and what country, again with Skelley we know that is USA. But I'd guess he has a Y=2006-08, M=Ridgeline, and have no clue whether it's a M=RT, RTS, RTX, or RTL. YMM=Year, Make, Model. CBR it's also helpful if you provide your location, why, well specific to this topic only Canadian RL's included DRL's until 2009, so if you had a MY 06-08 with them in the US, we would know it's an aftermarket kit or a conversion to a Canadian DRL's. But if you want to be clever, abbreviations and nicknames are fine. RANT OVER
Now back to the topic at hand, CBR, install your incandescent bulbs in one or both DRL sockets, that will confirm the LED bulbs didn't short anything out or blow fuses or damage relays. My guess, since the first LED worked with an incandescent installed that is all that is necessary to confirm Fuses/Relays are good. Then reinstall the offending LED, check for directionality, it does matter on LED bulbs, maybe even swap the LED's right to left to see if the 2nd is shorted out. Lastly if all that seems OK, but it's still not working with both LED's installed, my best guess is the LED's are not meeting the load requirements of the relay, at that point replacing or rebuilding the offending relay is the issue.
Getting to the Relay does not require "tearing the dash apart", although I guess that may work, I have no suggested methods to do that. Taking the drivers seat out would help, but disconnect the battery so you don't set off the airbag in the seat back. Otherwise get limber, cause your head goes between the "dead pedal" left foot rest and the break pedal, shoulders on the floor mat, and hips on the drivers seat, feet about on the seat back or wherever you can to get comfortable
I know the flasher Relay has issues with LED bulbs, and there is a workaround for that on here for the cost of a cup of coffee, also site sponsor Diode Dynamics, sells a relay for the flasher issue for like $60.
Anyways, that's the approximate order I'd troubleshoot this in, YMMV...