It is not usually that hard to renew the sealing strip on these ports. They tend to stiffen and break down over time. They tend to vary in dimension and shape, so one needs to take one of them, or a sample of the seal, to a chandlery to match material. The discolouration under the port may be more cosmetic that actual rot, but if it is rotted, that can be replaced, but is a bigger job.
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Pete
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