Trace Elliot 1210 vintage volume and gain not working! HELP PLEASE

Hi

I have a Trace Elliot 1210 series vintage one, I had this amp for 6 months now (bought it second hand) and never had a problem except last week we went for a recording and since then it hasnt worked.

The recording was done by students so I don't know if they plug in anything in it that actually damaged it!.

Just after the recording we took it down back to our studio and plugged it in as usual and then as soon as the power came on there was no sound, the gain and volume were to the max but I could only slightly hear it when playing the bass.

Does anyone have any idea what this could be and the easiest way to repair it?

 

I think, I will take your advice and take it to a tech
Thanks