I would like to thank you for the repair work on my Marshall JCM 2000 (TSL122) Combo. The amplifier had the well-known bias drift problem. After years without success, I have finally found a highly knowledgeable amplifier technician. I was very impressed that you were thoroughly familiar with this amplifier. Equally remarkable was the highly detailed repair work that has completely resolved the bias drift problem. I’ve been playing the amplifier with a huge grin for hours and hours…I now feel confident enough to gig with this amplifier. Thanks again Dennis!