Auto Pilot was MANUALLY adjusted after the pilot was locked out according to those who monitor such things.
At first I dismissed the claims that he changed the altitude in the altitude window (dialed it down to "100 feet", really 96 feet on the data with altimteter set at 1006 hectopascals, hPa). How could they know what it was changed to? By counting the number of "clicks" over the voice recorder? The DFDR data is not available -- the CVR (voice) is the only data source otehr than radar tracks.
It turns out sometimes the transponder ping data does include what is programmed in the FCU (I think it's called in the A320). I wouldn't have believed it before reading the detailed explanation from FlightRadar24, though I think they must be referencing data transmission over CPDLC, not the radar transponder over-air transmissions.
But now that claims are emerging that he converted to Islam over his break from training, I feel more comfortable with the theory that the act of crashing the airplane was a deliberate act -- and yes by a devotee of the ROP.
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http://speisa.com/modules/articles/index.php/item.1086/the-co-pilot-of-the-germanwings-airbus-was-a-convert-to-islam.html
http://forum.flightradar24.com/threads/8650-We-have-analysed-the-raw-data-from-the-transponder-of-4U9525-and-found-some-more-dat?p=64616