San Jose Mayor Ron Gonzales said Thursday that he has demanded City Manager Del Borgsdorf explain what he and others in his office knew of concerns about favoritism in a multimillion-dollar technology contract after an independent investigator this week concluded all of Borgsdorf's aides knew and the city manager himself ``more likely than not'' also had been briefed. Borgsdorf for months has denied that he or any member of his staff had been warned of serious legal problems with an $8 million contract to install Cisco Systems equipment in the new City Hall. However, an independent investigator said Tuesday that...