Solution : https://service.sap.com/sap/support/notes/424301 (SAP Service marketplace login required)
Summary : Key words : Related Notes :
When executing APYR3FIX in SAP environments, error CPF3770 signals failure in saving or restoring objects in library PCH
library pch<release>optin, library gen<release>optcause, entered command apyr3fix, enter command apyr3fix, -enter command apyr3fix, existing kernel library, kernel library, command apyr3fix, library objects, command cpylib
415227 AS/400: Importing the 4.6D ASCII Kernel (Patch 620) 406859 AS/400: Importing the 4.6D kernel (patch 543) 64886 AS/400: APYR3FIX terminates 49365 iSeries: Applying a patch