[R-390] Filter cap temperature

[Barry]

While tinkering with the "new" R390A last night, I noticed that C603 is
getting slightly warm.  The other cap is cold.  Is this possible an
indication of low ESR?  Do these old caps generally leak a bit or should I
be concerned?  I hadn't planned on replacing them as they seem to be
working, but if they're going to blow, then I'd rather go ahead and
replace/rebuild them.

Thanks,

Barry - N4BUQ