I would be surprised if they have all failed at the same time. I would in the first instance check the electrics - fuses, switches, connectors and wiring.
To save you time here are the pages from the '94 and '96 US spec (LHD) FSMs which cover the convertible roof and lid. Both include the wiring diagrams,
the '96 has a later style of circuit depiction (also see page EL-163). An auto electrician should be able to work off these pages.
94 BF47-53.pdf
96 EL161-169.pdf