Clarence,  I had to service one of these before and, sad to say, you
have to take the upper part _completely off_.

With some sort of tape, mark all the tubing with numbers and disconnect
them.  Loosen all the items that is holding the upper part in place.
Remove the upper part and service.  Then replace everything.

And don't forget to charge the customer for all of this!

Duaine Hechler
Florissant, Missouri
http://www.hechlerpianoandorgan.com/