I found this in an earlier post on the board, thanx to Mesa Boogie / Mike Bendelli.
1. Existing trace connecting C5 to LDR2 must be cut
2. Replace R292 with 1M resistor (stock 470K)
3. Add 1MA pot ("Lead Drive) after R292 (see above under 2)
One can move Reverb pot to the back of the chassis, and replace original front mounted Reverb pot with the newly installed Lead Drive pot.
Be carefull with those charged capacitors!
