In addition to routine monthly maintenance, there were 17 instances of repairs defined as “non-routine,” including to replace broken steps and troubleshoot a fault in a safety circuit.

They never re-enabled the safety circuit after performing the upgrade and restoring the elevator to normal service.

Maintenance workers failed to enable a door safety circuit on an elevator moments before an advertising executive was killed after stepping into the elevator in an office tower in Midtown Manhattan, according to officials from the city’s Department of Buildings and the Department of Investigations.

Two workers from Transel bypassed the door safety circuit with a jumper wire while performing upgrade work on Dec. 14, on elevator number nine at 285 Madison Avenue, according to the Buildings Department’s findings.