Following up to my msg above, I fixed the problem by soldering the cap back into place. Used a precision soldering station set at 620 deg C with a superfine tip, and held the cap down with the tiniest amounts of flux paste, applied to the solder points with a dentist's pick. Applied the soldering iron while holding the cap down with some tweezers (otherwise it may have lifted and possibly burnt on the iron tip), being careful not to accidentally de-solder surrounding resistors. Although the soldering station was equipped with a microscope, I think it is possible to do this job if you have simpler equipment: good eyes, a steady hand, sharp tweezers, and a fine soldering tip.
Last edited by tagaravabha : 12-11-2009 at 08:16 PM.