Hi,
The pressure on the LC1260 G7111B drops after a few injections. The pressure test passes on the pump side, but after performing the test a few times, the pressure drops from 600 bar to 30 bar, which results in failure of pressure test where the blank nut at the pump head valve. Same happened on normal injection, system working very well but pressure fluctuate after some injections.
Note: The head valve has been replaced, all pump seals have been changed, the MCG valve is new, and the lines have been purged with no bubbles detected.