If it's any help I've just removed the front seats on my latest project and found working on the 75 seats is relatively easy.
I found on my donor seat (for passengers height adjustment) the wiring for the heated seats were worn through to bare wires both where it flexes to recline and where the wiring was looped between the metal support and foam cushion.
Fortunately the original wiring on my car had not suffered any wear but I re looped the wiring to hang below the metal support.
When it comes to removing and stripping the seats down I found this easy and had the leather covering off within five minutes.
Having said all this on my current V6, after having no heated seats for almost the entire winter of last year I found that the fault was simply poor connection at the multi plug under the seat.
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