I can feel your pain. A few years ago I got a drip from the heater on my Mercedes E500. Nothing in the manual or online, so out came the seats, centre console, carpets, upper and lower dash, drop the steering column, instruments out. It ended up stripped completely down to the bulkhead. Part replaced, heater and everything else reinstalled. The neighbours were amazed when it started, drove and everything worked. Two days it took me and I was mighty proud of myself, right up until a while later I had to do the same job on my 320 estate. I figured out that with a little upside down, double jointed faffing I could do the job from the engine bay side in an hour and a half. Oh well, live and learn.
I don't know if you are connected to the interweb off the coast of Africa, but stay safe and best wishes.