I had the same problem with a Cayin integrated. I thought it probably needed a new switch. I took it to a local tech, it turned out the switch was just out of alignment. He wanted to return it to me at no charge. I insisted on paying a minimum bench fee.
HMMM.
I recently bought a Musical Fidelity X-P200 Power Amplifier. I have an issue with it. The Power Button in front is stuck in the ON position. To turn the amp on or off I have to turn off the power conditioner it's plugged into or unplug the unit.
Is this an easy fix? By easy I mean can a person repair this on their own? Or do I need to take this in for service?