W116, Body and Interior Specific Aid

Have a newly acquired 79 300sd w116 - Looking for help/ advise on procedure to remove and replace the steering coupler assy. - this is the metal coupler with 2 Hex head bolts clamping onto the stering column shaft on 1 side & Steering Box on the other.
Do I
a) loosen pull out the steering column shaft via the inside steering column / wheel assy inside
b) Loosen - drop the steering box assy

Has anyone done this that can advise on the best way.

Dear Friends!
I am an owner of MB 300SD 1982. Recently, the car presents disabling electrical issue which I hope to pin point eventually. There is a electrical surge somewhere under console ( I can hear climate control clicking) which drains all electric charge (battery). When it happens all my dashboard indicators go wild. Surprisangly, all fuses stay intact. I suspect it may be blower engine goes bad, but I am not sure. Anybody had this problem before?

After I got the heater blower fan to work (fuse)last night I found that the fog lights, turn signals and low beams not working this morning. Do these items have any thing in common? Parking, high beams, brake lights are OK.

AndrewG