http://www.routledge.com/u/electrical/
Unless there has been physical damage it is difficult if not impossible to tell whether a capacitor is serviceable or not, this video shows a simple method onhow to test a capacitor using a basic multi meter.
Lecturers get access to 15 other videos for your VLE and to use in the classroom with Electrical Installation Work: Tutor Support Material at http://www.routledge.com/u/electrical/tsm/