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Power Cal Failure Source 1 Port 1 Unlevel

Question asked by kevinagilentforum on Oct 8, 2011
Latest reply on Oct 10, 2011 by kevinagilentforum
Hello, I have a 5242A-2port 10-26.5 GHz PNA, yesterday it started showing an error, Source 1, Port 1  Unlevel. The PNA now fails the OP-Check as well. If I run a 2 port cal (ecal) and then do confidence test all looks good.

Any idea what to try? Ive attached some screen shots, of preset condition, operator confidence test and source cal (port 1 fails an port 2 passes)