Lots of WTF on this one... it's NOT drawing too much power - no way can a pair of LED ditch lights draw more than 20A. Typical ditch lights draw 18-20W each, so 40W is less than 4A. And, even if they did, all that would happen is the fuse for AUX6 would blow. Nothing that would cause the funkiness with the DRLs. My guess is they also fiddled around with the wiring (either intentionally or inadvertently) at the headlight connector.
Also, the fuses for AUX5&6 are in the main PDC - only AUX1-4 are in the AUX PDC.