Renault Megane Electric Windows - Next Thrillng Installment?

2003 Renault Megane Sport Tourer.

F/N/S window will only travel down irrespective of which way the F/N/S door-switch is activated. Same result if F/O/S switch used. Happily, window rises to the closed position when 'double lock' state is activated using remote key-button. This suggests electronic rather than mechanical problem. Any suggestions gratefully received especially if stated in terms appropriate to an electronics dunce. Thanks in advance.