Why don't you isolate it first. First remove hose from shifter (it's a faff) and see if there's any debris there.
Then reconnect and remove hose from caliper, see if fluid moves through system. If it does, then move on further down the system. Connect syringe to calipers and push fluid through, see what happens.
Thanks for this. Just tried that and the shifter doesn’t move any fluid through the system.
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