[Station X]

I can't say I've ever heard of "warming up" capacitors before. I assume the person who suggested this meant reforming electrolytic capacitors which is a common procedure. The mains filter capacitor isn't of the electrolytic type and attempting to reform it may cause it to explode.

Snip out the mains filter capacitor leaving wire ends which are too short to touch each other or bent so they don't touch each other. This will make it easier to grasp the wires with thin nosed pliers when you unsolder them later and fit a new capacitor should you wish to do so.

The replacement capacitor must be a CLASS X TYPE.