This DM story…
http://www.dailymail.co.uk/news/article-3600761/Body-parts-seats-luggage-MS804-search-crews-Horror-relatives-discovery-EgyptAir-jet-parts-dashes-hopes-loved-ones-survived.html
… contains a snippet from the ACARS data but it is in photographic form and thus not google-able, so I'll type it out, here
00:26Z 3044 ANTI ICE R WINDOW
00:26Z 561200 R SLIDING WINDOW SENSOR
00:26Z 2600 SMOKE LAVATORY SMOKE
00:27Z 2600 AVIONICS SMOKE
00:28Z 561100 R FIXED WINDOW SENSOR
00:29Z 2200 AUTO FLT FCU 2 FAULT
00:29Z 2700 F/CTL SEC 3 FAULT
The news article 'cuts to the chase' and focuses on the smoke in the lavatory but it occurs to me that the only windows which need anti-ice would be the cockpit windows and, perhaps anti-ice is a pre-requisite to opening the sliding window, when it is -40°C outside. This is a really desperate attempt to clear smoke from the cockpit, I fear.
The rush of air forces the smoke into the ventilation system and the lav has a smoke detector because it is not watched over continuously by crew or passengers.
We'll need a proper expert to answer what the fixed window sensor is there for.
The DM article explains FCU and SEC 3 but it is so long, I forget where. Faster to search the internet for the jargon terms.
Article also mentions a recent return to point of departure, with an engine fault. 'Bleed air' provides cabin heat but can feed smoke into the ventilation system, in the event of a serious engine fire. I am more inclined to believe that smoke inside the avionics is more likely to have come from the inside than to have percolated in, from the cabin.