Ken,
On the only coach of that period I have had experience with, it was behind the water tank (Right Rear corned) under the bed and accessed through a too
small opening. One I know of, if you peel back the cushions, there was a panel that could lift out, but I didn't have to work on that one.
Matt
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Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit