ECB purchases of govt bonds for last week amounted to EUR 4 billion,
matching previous week and bringing total to EUR 55 billion:

Week     Purchases    Total
1           16.5            16.5
2           10.0            26.5
3           8.5              35.0
4           5.5              40.5
5           6.5              47.0
6           4.0              51.0
7           4.0              55.0

That’s a lot of greek bonds, presumably the ECB is buying enough to support rates sufficiently so they can refi themselves.