tek 453 trigger issues

[m3vuv]

hi ive got issues with the triggering on my 453,firstly it  wouldnt trigger on ch A or B,i washed the whole scope down in the shower and dried it,it now works fine on ch a but has a hard time triggering on ch b,its odd if i remove q454 and q 464 it makes no difference,the displayed waveform is very jittery but sort of triggers,the level control seems very sharp on chB but normal on ch A,any idea where i start looking?  q454 was dead so replaced it but made no difference i suspect a cap ,Its a later scope with the fet front end.

[m3vuv]

well ive replaced a resistor and a couple of caps+ a tunnel diode ,it now seems to sort of trigger on both channels but the display still moves slowly across the screen on both channels,will this be a trigger problem or sweep or even tb?,not sure where to start looking,tia.

[med6753]

If you run through the trigger calibration section of the manual it might give you a clue as to what is failing.