I concur with kebowers as well, those noises can be caused by the components he described, but with the low mileage???
Maybe at 148,000 miles, but 48,000??? Seems odd. Was the car formerly used by U.N. peacekeepers in Yugoslavia?
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car