JB,
I applaud the previous responses for recognizing the potential danger of your question.
I'm not sure how to respond to your question? Who was the guy watching the door? Is he a mechanic too? Are both of you elevator mechanics? Where is your training from? NEIEP, NAEC or LEIA?
If you are a trained and educated elevator mechanic? I suggest you ask your supervisor for help. Explaining how to perform such a task in public or private WITH NO KNOWLEDGE OF WHERE THIS INFORMATION IS GOING TO is irresponsible, reckless and criminal. Even a two bit ambulance chaser would love to add such a person to his case. And if you where not aware of this, let me be the one to educate you! A District Attorney can bring criminal charges against an individual.
If you are not a trained and educated elevator mechanic, I suggest you call any licensed and insured elevator service company.