I think study reveals that losers tend to change their decision. And in this case, there is still 50-50 chance after one goat is revealed. So, I won't change the decision.

http://www.bbc.com/news/science-environment-27228416

Between, I tried to solve Q1 regarding bulb and room this way.
Room=>> R1, R2, R3
Bulbs=>> B1, B2, B3
Turn on B1 and B2
Go to R1.
Cond1: If lights Off then B3=>R1
Cond2: If On , B1 or B2 =>>R1
Cond1:
B3=>R1
Turn off B1 (B2 is still ON!!)
Go to R2
If Lights on, B2=>>R2 and B1=>R3
If lights off, B1=>R2 and B2=>R3
Cond2:
Suppose lights in R1 was on
Turn off B1 and go to R2(B2 is ON!!)
Cond 2a: if Lights on: B2=>R2 and B1=>R1 and B3=>R3
Cond 2b: If lights off: B2=>R1 and B1,B3=>R2,R3
Cond2b: Turn off B2 and turn on B3
Go to R3
if ON B3=>R3, B1=>R2 else vice versa