6100 B+ not holding/erratic

DanoND

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I redid a 6100 (LV2000, Bob's full repair kit) and its been great for about 3 months. Just a few days ago the screen size started going nuts (big/small quickly) so I checked B+ and found it was about 30 volts low. I adjusted it back up to 181, but it slowly drops the longer I leave it on (and the screen continues to "jump around" in size).

Using the FAQ I understand that Q900 through Q903 are regulating B+. Do I have a transistor going bad, or maybe C910?

Anyone have any suggestions?
 
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