Garret

A friend brother provided me a printout of the dealer services provided by a local Lexus Dealer (Phoenix AZ). It includes a comment (at 90K miles) 90000 MILE SERVICE NON WARRANTY - NON OEM . What would this service have included? I have 158K miles on my sweet running Pearl White 1993 LS 400 but am concerned about the timing belt. Is the timing belt the same as the serpentine belt? Thanks, AZdogg