Hi Chris!
Reflective metering of general scenes can be very tricky. The meter is designed to suggest a value off an 18% grey card. If you meter lighter subjects, it'll suggest an lesser exposure than needed. You can substitute a grassy portion of the area to be captured, or the palm of your hand instead of a grey card and be reasonably accurate.
As for a CLA, before you do, listen carefully to the speeds as you cycle the camera through it's shutter speed range. If they sound like they increase or decrease linearly, you may be OK. Also make sure the iris opens and closes as it it should.
The Rolleicord is anything but a cheap camera! It's worth a CLA if needed, but for maximum fun try it without if the speeds and iris look good.
Jo