all of the PD engines have been know to have CAM problems, the 150 is more common as they generally get more abuse.
Most of the time this wear, is down to the wrong oil being used or not changed at the wrong time, although some people have had problems despite using the correct oil.
My TDI 150 which uses the same engine as the Anniversary (code ARL) has just passed the 95k mark and still going strong
a list of other common faults can be found
here