I stumbled into 2 SINALOA WRENS in the canyon today. I was returning from a shady and cold 1.7mi picnic area and stopped at the first place along the road that had sun. Location was approximately 1.5 miles from the canyon entrance (there is a road on the west side of the canyon at this location). Time was around 9:15am.
The wrens were in one of a number of brush piles on the east side of the canyon. Note that several Bewick's Wrens were also present. I was some distance from the birds, but got the impression they were juveniles.
Lots of RED-NAPED SAPSUCKERS and other woodpeckers near the original Sinaloa Wren stakeout spot near the bridge.
Mileage note: The "1.7 mile" picnic area is actually close to 2 miles from the canyon entrance. This is because the "0 mile" reference point (used by runners) is a short distance into the canyon from the entrance.