Og. OP1, dead sequencer button workaround

Hey people,

My sequencer-button just died. Had that well known double/-non trigger problem on some keys for quite a while, cleaning and disassembling/reconnecting the flat-cables did it for some period, but now I assume the sequencer button to just stay unresponsive, and there’s no chance left with it. So, do someone know a workaround how to toggle sequencer-mode anyway?