An ESR meter is only one of several ways to check caps,caps can have good ESR but still be leaky. Electrolytics are usually specified as being -10% & up to + 50% within specs, they may just need reforming, though shouldn't as they're new, but it's possible.
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New caps are physically smaller than originals and radial-style.
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It's the same for everything, Mars bars & Cadbury's Cream Eggs,though in the case of caps improved manufacturing, not stingy big corp.
I wouldn't re-cap unless a fault indicates there's something wrong, it's easy to introduce more faults if your not careful, if your going to re-cap, change one at a time then test. A lot of vintage gear works fine even after all these years. Check the power rails first for excessive ripple,either with a scope or click your DMM onto AC volts, anything 1v + ish is suspect.
Andy.