I removed the coupler, it was black with a small bottleneck. I grinded the bottleneck and order a new coupler.
Would like to do a complete cleaning of the nozzle but too afraid to remove the thermal sensor and heat resistor. Maybe I'll invest in these couplers:
And the olsson heat block to make the maintenance easier:
Finger crossed!
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Labern 775
You might have a deformed PTFE coupler.
there is a write up and images Here that may help
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