It works, but seems to be less warm than the passenger side. Is there anything that can done. From what I’ve read when it goes, it’s gone.

 

You can try replacing the heater relay under the seat

 

Just repaired mine, there was no heat at all on the drivers side, a broken wire to the thermistor in the back squab was the culprit. No signal to the relay shuts the whole system to stop potential damage.
The two seat relays are identical so can be swapped over to confirm if you have a faulty unit. The rotary switch could be dirty and require a strip and clean. Beyond that you get into the heating element issues which require a complete strip of the seat but if back and bass are getting warm they should be intact and the power supply should be the problem. If you can obtain the use of a heat detector gun you can check if only part of the element is heating.
Regards
Dusty