2007 GX470 Engine whining at low rpm. IMG_5965.MOV

2007 Lexus GX470. Just changed timing belt 123400 miles, water pump, tensioner and bearing. idler bearing, power steering pump...still have whine in engine compartment at low rpm and idle...atf in new power steering reservoir...

can timing belt cause this whine..using my stethoscope the whining noise is loudest at the front of the black plastic timing belt cover over the passenger side cam end.....

Any ideas or experience with this noise greatly appreciated.