Easy way to do a crude check on a cap is to measure the resistance with a VOM...volt-ohm-milliamp meter. Short the cap terminals first to be sure there is no charge that can damage the VOM. Measure the resistance one way and you'll see the resistance drop low and then rise as the cap charges up. Should eventually wind up high....in the 100K ohm + region. Then reverse the leads and the meter will bang below zero ohms and increase again as you discharge and charge the cap in the reverse direction. This will at least tell you if its open or shorted. VOMs measure resistance by applying a small DC voltage to the device under test, measuring the current and calculating resistance.
Al