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This boiler is locking out occassionally. The problem is the differential valve moving a little too slowly and not always opening the gas valve in time. I have stripped and cleaned the differential valve with initial success but now the problem is reoccurring. Does anyone have any advice? Thanks

3 year old boiler. Customer reported poor hot water flow. Checked burner pressure to find boiler is not modulating on CH or DHW. Burner pressure does not move from about 2 mbar. 21mbar available at inlet to GV. Suspected NTCs, Gas Valve, PCB NTCs are fine: have run with spares outside of...