Here are the two paper manuals I have:
HAYNES Repair Manual CHRYSLER PT CRUISER 01-03 #25035:eBay Motors (item 280370729548 end time Aug-11-09 08:28:41 PDT)
2002 Chrysler PT Cruiser Repair Manual 2001-2003
Both explain about the 2003 turbo models when there is a difference in what they are explaining. Chilton has larger pictures and about 50 pages of wiring diagrams compared to about 30 pages in the Haynes manual.
If the turbo hasn't changed that much from 2003 to 2008 it might be worth picking either of these up to help in maintenance.