Capacitor Value

I'm repairing a couple of LCD monitors and determined the cause in
both monitors to be defective Metalized Polyester film capacitors.
They were damaged by excessive heat on the inverter board.

The markings on the capacitor is "u18j100" ( the "u" looks like the
"u" in "uf"). I found a similar capacitor in an old junk monitor
board that has the marking "22j63". I put that in and the montiors
work fine. I am assuming the numbers after the "j" (5% tolerance, I
would think) indicate the working voltage, 100v vs 63v, so obviously I
need to get the right part. However, I am uncertain as to the actual
value of the original capacitor. Is this an 18 uf capactior, or 18pf,
or something else. My guess would be 18pf, 100v. They are in plastic
packages, about 7mm square, 3mm thick

Thanks

-Bill
.