optispark tracing marks inside the cap

[timopajala]

I took the opti out today and found that it has like burn marks inside the cap, no melting etc but color has changed in the cap where it has started to melt or something like that. In one point the melting part makes contact to another plugs terminal, so there could be missfire there or something like that. Is it common in these distributors that this happens? Its brand new dist, about 1000mails on it and its ac delco reman.