We present an analysis of new and old high frequency VLBI data collected during the last 10 years at 5–22 GHz .
For the jet components in the mas-VLBI jet , two component identifications are possible .
One of them with quasi-stationary components oscillating about their mean positions .
Another identification scheme , which formally gives the better expansion fit , yields motion with \sim 9 c for H _ { 0 } = 65 km s ^ { -1 } Mpc ^ { -1 } and q _ { 0 } = 0.5 .
This model would be in better agreement with the observed rapid IDV and the expected high Lorentz-factor , deduced from IDV .