Agilent 1260 infinity ii high back pressure

We are having a high back pressures issue with Agilent 1260 infinity ii, and the clog has been identified to be somewhere in the column compartment area between the heat exchanger inlet and the column inlet. However, we are stuck because we do not have access to the related capillaries due to the design of the vialsampler as shown in the picture.. anyone else had high pressure issues in that area? Thank you

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