Recently my 1993 ducato 10 motorhome selected 2 gears at once while doing a 3-point turn. Needless to say it stopped dead with a locked gearbox. After much wangling of the column gearchange I got it out of reverse, but it is stuck in 1st. External rod cable and jopints look good. Is this a case of selectors crossed up? Looks like a big stripdown to me. Any advice anybody ?