2005 TM roof skylights and vent leaking.

[coralcrazed]

I have a 2005 2720 unit. can anyone recomend the proper way to fixing a leaking roof skylight and vent? I was thinking just taking the frames off and using some clear silicone on the bottom of the frame that meets the cieling then use marine 5200 white silicone on the outside of the skylight. however, I'm not sure where the leak originates? so I was going to put some silicone on all joints. is there any problem or issue with getting on the roof? I'mm 220 lbs. thanks