Memo - mouse ball replacement

I have a photocopy of a fax of the supposed original IBM memo to service
personnel about replacing mouse balls buried deep somewhere in my files,
acquired back in the late 80's (when you had to FAX things to your friends
instead of email...).

I recently found the text for this memo on a web site, so I didn't have to
retype it.  I think someone may have added the last sentence, but I'm pretty
sure the rest is intact.

SO -  Is this true or an urban legend?  I have never heard from a credible
source about the authenticity of this document.

(see text below)
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MEMO:

If a mouse fails to operate or should it perform erratically, it may need a
ball replacement. Mouse balls are now available as FRU (Field Replacement
Units).

Because of the delicate nature of this procedure,replacement of mouse balls
should only be attempted by properly trained personnel. Before proceeding,
determine the type of mouse balls by examining the underside of the mouse.

Domestic balls will be larger and harder than foreign balls. Ball removal
procedures differ depending upon the manufacturer of the mouse. Foreign
balls can be replaced using the pop-off method. Domestic balls are replaced
by using the twist-off method.

Mouse balls are not usually static sensitive. However, excessive handling
can result in sudden discharge.

Upon completion of ball replacement,the mouse may be used immediately. It is
recommended that each person have a pair of spare balls for maintaining
optimum customer satisfaction.

Any customer missing his balls should contact the local personnel in charge
of removing and replacing these necessary items. Please keep in mind that a
customer without properly working balls is an unhappy customer.

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Steve