Blockage that causes high pressure in the HPLC 1100 in the rotor seal

There is a blockage that causes me high pressure in the HPLC 1100. The blockage is in the area of the rotor seal. I have tried passing 100% acetonitrile, it has not unblocked it. I have tried to pass it with 100% propanol, it has not unblocked it either. What could I do? Thank you very much.

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