The return code from TSS8859E RC=08 / RS=10 indicate that VSAM had to split a CA.
8(X'8') Logical error; specific error is indicated in the RPL feedback area.
16(X'10') The sequence-set record does not have enough space to allow it to address all
the control intervals in the control area that should contain the record. The
record was written into a new control area.
The certificate is actively being used without problem.
The messages he received was due to a VSAM split, which is normal.