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GS-e-cs4-i issues

This thing is acting funny again. Filled gun this morning to 290 bar from 100 bar. This evening it won't go above 150 bar. So tried the gun with same fill probe off tank works fine. Put dead head in just hose without filter and same issue. I can't hear air leaking from anywhere.

Check your burst disc (don't over-tighten it when re-installing) and then check your bleed valve.