I bought a 20-20-20-20 cap can last year to replace the old one on my 1972 princeton reverb. I was doing some maintenance on my amp today, and I removed the cap fully from the amp, so I decided to see if it's working correctly. All 4 lugs measure the correct capacitance. However, when I test the resistance from each lug to ground, 3 of the lugs have some leakage. I don't know if it's enough to replace it, however. One lug measures infinite resistance to ground. Another one measures ~50M, another measures ~30M, and another measures ~60M. What do you all think? Should I replace the cap?