Hi philippe, if you search on the Technical Documentation page of the portal and search for: 4200, R8.0, Service Manual - Hardware Replacement Procedures Part 1, Rev. A, 009-2011-254.1, you should find it after selecting: 4200 Advanced Services Platform > Document Sets > Release 8.0. You'll need to scroll a little to find it, but it should be there. Let me know if you don't see it.
I just wanted to check in and confirm that you were able to find the document, or had any additional questions.
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