I'm trying to repair an old PC Engine game console and one of the missing components is a capacitor that looks just like a resistor. I'm not familiar with these and don't know how to read the colour bands or what a suitable modern equivalent might be. It's C137 in the picture, can anyone help? Thanks.
Based on the color code (assuming all three bands are red and assuming it's a cap from the designator on the PCB), that's a 2.2nF MELF capacitor.
See also the photo in this question which shows some similar leaded parts.
The similarity of body color to the resistors is a bit disconcerting though, I suspect it might not actually be a capacitor, but there is no way to be sure without more information (or by measuring a good one).