In article , NOPSAMmm2005
@bigfoot.com says...

If I were you, I absolutely wouldn't do anything until the ceiling
below got stained. It might be dripping within the pipe, or it might
be leaking, but I've gone 22 years with no problem and no water in the
globe from probably 14 or 18 years of those 22.

Assuming, of course, that 20+ years of leakage hasn't caused rot.

--
is Joshua Putnam
http://www.phred.org/~josh/
Updated Bicycle Touring Books List:
http://www.phred.org/~josh/bike/tourbooks.html