Nobody at our Advertiser remembers the Aloha Boeing 737 that blew its top.  737s are rather unique in that they have an "attic" up front that is used for equipment like electrical "ballast bars".  This attic is not air conditioned so weird things can happen.  Especially if the aircraft is used for frequent, short flights.  Hot-cold, dry/humid air in the attic can cause corrosion.  I helped overhaul every B-737 operated by a not "friendly" airline.  The cabin environment can effect not just passengers.