Thelonius

Hey, apologies in advance for what I know is a semi-dumb question, but I'm trying to sell off a Lynx II for a buddy and it's got a stuck button. Am I right in thinking that the most likely fix is to just to take it apart, swab the flex membrane with some isopropyl alcohol and then put it back together? Are there any other parts usually involved? Is it possible to just spritz electronic contact cleaner in the directional button area without taking things apart? If I need another membrane, it seems like Best would be the source... are those tough to install? (I'm semi-decent with a soldering iron.) Thanks in advance for advice.