I would go up on the roof to the general area above the light and if there are any seams or vents or pipes close to the area check the chalking for any cracks and reseal. I did not know FR installed aluminum roofs with that said if he is real heavy cut some 8" x 4' sections of 1/2 ply to walk and kneel on to spread out the weight.
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho