It would be silly to spend any more money to "upgrade" to another Otis controller. They're looking for ways to make money on existing equipment. Otis must be done trying to scam their customers with the "you need to replace your hydraulic oil" trick?
You would be much better off to replace it with non proprietary equipment (read, virginia controls mh3000 or mce motion 2000 with Gal operator and gal or innovation fixtures) and get 40 more years out of your elevator for probably the same money.
Either way, I wouldn't be looking to modernize your elevator unless it is already having a lot of issues consistently. If it's not broke why fix it?
Just my 2 cents
