Small bubbles *in* the glass are fairly common, and are called "seeds".
They most probaby have been there since day one.. and the lens was built and tested with them. I would *not* worry about them ... and trying to disassemble a lens is always accompanied by possible damage. One thing to be considered is the possiblity of trapping humid air between the elements - adding to the possiblity of fungus.
So far, the fungus-affected lenses I've seen appear to have a randomly shaped "black cloud" internally. Something in appearance to a spider web would not surprise me a whole lot ... I have heard of those.

The same advice given for any cleaning would apply: "If you can get by (consider results) by NOT doing it ... *DON"T*!!!






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