The owner doesn’t mention the lift was upgraded as well in 2000. But we know that any lift will be abused during a 6 story building rehab...because thats what happens.
As far as a “full MOD” goes, which it sounds as though that’s the proposition, the price sounds reasonable. # 9&10 must be together as I’m hoping “lock kit” means ALL door interlock contacts for a complete door package minus new nylon door sill guides (not listed).
No mention of new hoistway wiring, or pumping unit/valve, whether to replace or retain/refurbish. The list should state 2 infrared edges too as the OP mentions 2 MOVFR operators.
And as has been mentioned any costs incurred from your local codes for safety i.e. smoke detector locations and annunciation panel capabilities from old to new.
Be sure your installation company is state licensed as well as their field employees.
If the customer building owner insists on a full modernization, get three reputable company bids and check to see that the proposed scope of work is the same for each.
But...Rolly brings up a good point. IF the customer has a service contract, how are these operational issues being addressed? Or is it a strong arm tactic?