I have recently had my ML27.5 repaired, and I'm hearing some distortion most noticeable on female vocals but also soprano sax etc. What I'm also noticing is that after switching the amp off the red LED pilot light dims but does no go out completely and only will if I pull the power cable. The amp stood idle for about 9 years and I can't remember if the LED always behaved that way. Anyone with the same amp able to comment.