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You can dismantle and descale the parts of the group head without removing it from the machine. See espressomyespresso.com by Randy Glass and click on the link to " Overhauling and lubricating the E61 group".
If a blockage is the problem then it is very likely to be the gicleur and/or the filter screen associated with it. A good descale/clean of them may well solve the problem.
If a blockage is the problem then it is very likely to be the gicleur and/or the filter screen associated with it. A good descale/clean of them may well solve the problem.