You may remember this one from another blog post where I scratched the shit out of the neck pickup cover ("Being a Professional Means that you Don't Make Excuses").
The hollowbody dropped by the shop recently to swap out the 0.022 mfd mica tone cap for a smaller 0.015 mfd Emerson paper in oil cap. The player was looking to dial in the tonal sweep a little closer to his likes. The general rule is that the higher value of the cap, the darker you can cut the tone. Smaller values do not roll off the tone as deeply.