In need of opinions

[NSTS1470]

Where to start. Over the season I would see soot coming out of the exhaust of the heater. If heated fine, no problems at all. It's at the rv center now and they claim now that when they ran it there was no soot. They say from outside all looks and runs good. But then told me that it would cost 2hrs labor (roughly $150)to take it out and inspect. but they assured me they saw no soot. My question is, could this be possible that it now no longer blows soot?


Question 2, in regards to my slide out. On occasion(prob 1 out of 5 times) when I go to extend it it makes a ratchet type sound but doesnt move. Give it a push and then it will go. Once started it goes out fine and never has a problem retracting. Dealer told me that I need a whole new actuator/motor and they will have a price for me on tues once they call Keystone. Holy ****, that seems a bit much considering it is only on the initial start of extending. so does this seem correct.

I dont know enough about these things and hate to get screwed by the rv center. Any help on these things would be greatly appreciated.