It's accessible now, 1990LS400. I've dl'd all 62 files and in the process of stitching them together.
BCRCornet, try this from the good folks at Lexus Customer Satisfaction --- U.S. --- Canada was no help at all:
1. Go to www.lexusdrivers.com. If you have an account, you can log in. (You do not need to be logged in to access this resource)
2. Select "My Lexus" from the task bar at the top of the page.
3. Select "Vehicle Resources" from the left side of the screen, and then select "Online Owner's Manual" from below.
4. Select the desired manual and enter the Model and Year in the appropriate fields and then press "Search"
HTH