Hello, I have an east German Eb rotary valve trumpet from around the 70's or 80's. I recently took a break from playing it and was just playing my Bb cornet. When I picked up my Eb yesterday I realized how 'out of tune' it is. I always have noticed it, but yesterday it seemed almost impossible to manage. The problem is that the second valve has no tuning slide and I think its this valve that is out. The trumpet is in good condition with no dings or dents. Any advice or knowledge would be gratefully received. Thanks.