I just got my powerbook back from Apple today and the following codes are listed as items that were replaced. I can infer what some are, but am unclear as to the other, non-obvious, ones. 1. FLX CKT Assy, HDD, PB15'' 2. DA Toshiba Pluto 4200RPM 80GB HD 3. Thermal Module Assy, PB15'' 4. PCBA, MLB 1.25GHZ, PB15''