The Thyssen Service Tech should lock and tag out the elevator. Is it not Thyssens responsibility to remove water from the pit. The car should be locked and tagged out at the top floor and jack stands installed in the pit, the tech then should get with the building to schedule a time for a high water alarm and sump pump to be installed. The car should not be allowed back into service until the building resolves the flooding issue. All rusted equipment and electrical equipment should be changed and billed to the customer. Building personal shouldn't be allowed to access a pit without a Thyssen Mechanic on site since we take the liability for any accidents that happens on that unit. If you cannot fully resolve the flooding issue then a alarm and sump needs to be installed asap. Also since the pit had water damage you also should be billed for the pit to be painted or hire a contractor to do it while a TK employee supervises the accessing of the pit. Since you are being billed for it, request someone else besides the tech to come and be on the property for the couple days it will take to install the alarm, sump, dry the pit out, change all affected equipment, and to paint the pit. A billable repair mechanic should be there. The service tech has a route and calls holding and cant be there for the time needed to properly take care of your problem. Yes this will be costly but in the long run it will save you big. You need to get ahold of the Thyssen office get a signed proposal that has the scope of work and the time allotted. Then there is no miss communication.