Thanks again to all !
Based on the comments and the references I plan to:
- Thorough cleaning including the sumps
- EGR cooler delete
- Replace oil cooler
- Updated Turbo supply and drain lines
- HPOP o-rings kit (looks like no STC issue for 2003)
- New ICP w/dielectric grease and pigtail
Please let me know if I missed anything important. I prefer to stay away from the valley of the motor for another 200K if possible.