System Startup Self-Test 28 error

Hello.

One of our clinics employs NDA Julian from Drager - 2000 release.

During the self test, it gives an error code - SV: 0 0 128 0

What is the problem in the pressure sensors or in the PEEP valve?

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crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0