If the stories are untrue then your employer, because of the actions of this lead, is committing claims suppression.
L&I does not like this type of claim interference.
See the link below to better understand claims suppression, and your remedies.
You can win this but will probably want to get a workers compensation lawyer to help.
The lack of handrail is another issue, and may involve the landlord in a possible third party claim. see link below and talk to a personal injury attorney about this.
Were you in a car wreck? If yes, there may be issues with who is liable for your injuries.
If you were injured from the wreck and not the job, L&I likely is not going to pay you for the injuries.
You should review your specific facts with your attorney to find out your legal options.
Assuming you we're hurt at work and not in a car wreck, you are going to need a good, aggressive workers comp lawyer to protect your rights. The deck is being stacked against you right now. Don't delay getting legal help. Good luck.
This answer is intended as general information and not as specific legal advice. If you want to have a free consultation with me, please contact me through AVVO.