The Ancient Greek: "Simple probable explanation :-
Smoke warning does not always indicate real smoke. it could just be a detector fault.
If an inspection does not find smoke ask base for advice and go where the engineering facilities and spare parts are available."
Greek, if you're an airline pilot, please ensure to make a 'Gate Announcement' about your Pprunne Moniker, each and every time, so if one day I happen to be scheduled to fly on your flight, I will ensure I won't! Un-freakin'-believable!