Not a chance. I have never seen a head gasket sealed by retorquing. The problem in gasket leaks is that the resilience is gone from the gasket and its just a hard shiny surface now.
BTW, MB thinks enough of this problem that they have a special section in their diagnostic directory discussing diagnostics here. The procedure as they see it is to reseal the cover using their new sealants and techniques. If this don't fix the leak it is to be considered diagnostic time and is the only way to verify which is the problem. It can not be discerned even with flourescent dye, believe me I've tried.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician