I assume you're talking about the standard model, not the turbo.
Subaru does not call for maintenence at 50K. However, at 52,500, it calls for:
Oil change, including new drain gasket.
Check & top off fluids. Lube locks & hinges.
Rotate & balance tires. Inspect brakes.
Inspect belts & hoses. Inspect Steering Linkage & Boots.
Check for leaks. Check drive axle & suspension. Inspect exaust system.
Examine all lights. General safety inspection.