Harmonic damper on left was failing at the rubber damper seam and moving rearward, rear face of outer ring of damper was coming in contact with timeing chain cover and carried serpentine belt into cover contact also. Talk about a squeel that you cannot pinpoint or adust out. Check your damper condition periodically. Things get real exciting fast if they do seperate. Freshened up another damper off older spare motor on right. It's workin fine.