Here are 3 Boss pedals I’ve had in for repair at our workshop; a DM-2 analogue delay, an OS-2 overdrive /distortion pedal, and a DD-3 digital delay.
Boss pedals are, in my experience, very reliable. None of these pedals had major faults.
The DM-2 (which for the uber pedal geeks was the earlier MN3005 version), needed a new DC input connector.
The OS-2 had suffered from the wrong power supply being applied to it (probably AC), and needed both the op-amps replacing as well as the polarity protection diode and the first filter cap.
The DD-3 needed a new mode selector as the old on had suffered a gig injury.
