It's soon time to do some rear suspension service. I have heard that on the 1988-94 IRS used on 760/940SE/960 sedan & 780, one or two bushing locations are common for replacement and most other bushings are rarely bad. Other than the upper differential mounting, what bushings should I consider replacing while things are apart?

Either describe the actual location, or post the part numbers so that I know which ones you are talking about. I have the exploded view with parts list.

The FAQ has this note:
http://www.brickboard.com/FAQ/700-900/RearSuspension.htm#MultiLinkRearAxle

Listen to board advice and act accordingly.

Thanks, but that was not particularly helpful. The FAQ mentions the one bushing that I already know about (and posted) and my question asked about the failure / wear of all the others.

While the 700/900 FAQ is very good, not all information gets there.