Hello. I got an used YTR-6335HS and it´s fine but sometimes second slide vibrates. I hace tried with slide grease but it comes again... I would like suggestions for solving that. Also, second valve is sometimes slow, it doesn´t happens if pressed without blowing, but has a "slow returning" sometimes when I´m playing and press 1 and 2 or 2 and 3, not when only 2. Surprisingly it uses to happens when I´m playng a concrete work.(!). It´s improving since I changed from Blue juice to Ultrapure, but still no perfect. I suppose it has to get accustomed to my fingers... Regards.