The relevant Professional Pilots Rumour Network Threads are below.
Note that it you are not a professional pilot, it is really not a good idea to post there, and especially not with 'newbie' questions and theories that are not backed by experience in the aviation industry. However, the forum publishers are nice enough to let other people read the forums, which can be an invaluable source of information.
Note also it is a Rumour Network - don't assume everything posted is correct. But there is a good signal to noise ratio.
PPRuNe Rumours and News thread: Indonesian aircraft missing off Jakarta
PPRuNe Tech Log Thread: B-737 Speed Trim System
PPRuNe Tech Log Thread: 737MAX Stab Trim architecture