There is a wear-in procedure in the Agilent 1200/1260 LC pump manuals. This wear-in procedure is for reverse phase seals, not normal phase seals. The manual states in the description of the seal wear-in procedure that normal phase seals would be damaged by the procedure. The pressure being over 300 bar damages the normal phase seals. IPA is fine with the normal phase seals.
Here is a link to the Agilent 1200 Series Binary Pump SL User Manual, the seal wear-in procedure is described on page 109: 1200 Series Binary Pump SL User Manual