Very low compression in cylinder 2

[DanSanDiego]

Hi,
I have 30psi of compression in cylinder 2. The remainder of 6 cylinders are all between 160psi-180psi. X5, 2003, 3.0i, 122K miles.

Any advise on what to do next?
Considering AC Delco Fuel Injector and Upper Engine cleaner to soak in the cylinder for 24 hours.

Is there another test I can do to determine if the problem is at the top of the cylinder or bottom?

Could it be the valve cover gasket or is it definitely the head gasket (top) or rings (bottom)?

Thank you very much for your advise as this could very well be a multi-thousand dollar problem.