B757-200
Flight Crew Last 90 Days 140; Flight Crew Total 8000; Flight Crew Type 180
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; General Maintenance Action
Procedure; Aircraft
Right generator - INOP; APU generator - intermittent.
Right engine generator inoperative; APU electric intermittent; returned to departure airport.
B757 Captain reports returning to the departure airport after the the APU generator; operating in place of the right engine generator; becomes intermittent.