An old trick I learned from a tech who repaired CRT televisions was to test components by spraying them with an aerosol. If something was close to failing, the

An old trick I learned from a tech who repaired CRT televisions was to test components by spraying them with an aerosol. If something was close to failing, the cold propellant would push it over the edge and you could target individual capacitors to identify which ones need replacement.