I hate to necro this thread but 3 years ago I was able to fix my Holier Grail by replacing the R1 resistor with a 4.7k 1/2watt based on knowledge shared in this thread. The pedal has failed again this time with the failed component at c3. Does anyone know what i’ll need to solder in at c3 to get my baby up and running again? It would be most appreciated.