hmmmm....bai, try kuno this brad...wala pa nako ni mabuhat...but when I was still working in an EMS firm
we repair oxidization by re-heating the solder...
try kuno clean the electronics with a 100% IPA Solution (Alcohol)...clean with a toothbrush payts na...
then apply flux...or you may resolder some points (touch up lang)..kanang naay mga puti-puti and some ashes usually on discrete components...sa mga SMD you refer to this picture:
naa sad juy uban na mudetorirate na ang mga parts...reliability wise, maoy after effect...hum or noise...
just my two cents...