help wanted S320 1997 lumbar support

[Dr Williamson]

Hi, new from over the pond. Abrupt failure of vacum pump acompanied by burning smell under rear seat of my 1997 s320. replaced unit - motor burnt out. All works (central locking,headrests,boot handle ) but lumbar support has not come back. I cannot see any obvious vaccum leak at the pump and haven't disturbed any other wiring. Are there any electrical fuses / relays on the seats to reset ? The seat heating works fine as does the seat motors. Any other tips anybody?
With thanks,
Dr Richard Williamson