Hi!
The information I have comes from the 350 manual, but it should be the same.
SR means Soft Ride and reduce the response of the Autopilot during turbolent flight.
Which model of autopilot there is on the 1900? Autopilot is an optional and maybe is different...
The two trim annuciators are in different colors? Maybe one is for the "trim in motion" an the other te 2trim failure2
AP should be Autopilot failure annuncietor, but you have more annuncitors than me so probably is a different model.
Just my two cent
Vanni