The lift crowd are right in saying the various older parts are becoming often near impossible to source, and certainly compared to modern plug and play like technology they are much more of a hassle and time consuming to up-keep. I wonder if there was any way to know who was replacing their lift before yours which might be available and from which you could commandeer parts?
In my experience lift maintenance is quite the closed shop to an almost mafioso level of arrangement between providers so going elsewhere is unlikely to address your issue. I imagine your annual budget must need consider servicing the current lift but also allocating future funds to totally upgrading or replacing the lift? There’s no cheap way around it unfortunately.