The cover that blew off was the side access panel to the compressors and electrical. Gas line enters thru same cover and so does the combustion exhaust. Also the cover which slides out protecting the gas train and burners blew off into the compressors. Most of the wires were burned up and the control circuit board was blown.
Apparently a prior service company worked on it last winter. It appeared they put aluminum peel and stick duct tape over cracks and then strapped them As for the wire I guess they ran out of straps LOL!
We removed all and installed new exch ,burners,valve,board, comb motor and all.