You can get replacement capacitors from Mouser, Digi-key, or Arrow, or a local electronics parts store.

Be sure to match all the requirements:

Capacity (micro Farads)

Voltage (V)

Temperature Rating (C)

Capacitor Diameter (mm)

Obviously, the manufacturer is not something you need to match.

You can go over on capacitor ratings to some extent so the monitor has more of a safety level when in use and less likey to blow to voltage. *this can be bad if the capacitor is failing due to over voltage, sometimes the cap is like a surge protector because it fails open.