I disassembled my Fender Princeton Chorus. This meant undoing four screws on top of the amp and then one on each side. After I had slid out the panel which holds the circuit board, I took photos for reference, detached all leads, removed the nuts around the pots and jacks and finally undid six screws holding the circuit board to the panel.
Immediately as I glanced upon the backside of the circuit board, I noticed a dark spot surrounding two components placed next to each other. The two components had the schematic numbers CR19 and CR20, which I quickly found in my paper schematic. Next to the markings CR19 and CR20 read the text '1N5353', which I assumed to be some sort of a part number. Using google, I found out the two components were 16V zener diodes (http://www.datasheetcatalog.com/datasheets_pdf/1/N/5/3/1N5353.shtml).
After a second round of googling, I had found a store selling such diodes in my home town. The price for three was 2.79€. Not too bad. Will get them on Monday.
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