Can the owner ask for a replacement?

Legal analysis: the security guard is hired by the property company, so you can ask the industry Committee. The industry committee may convene an owners' meeting to change the property company, and the property company may fire the security guard, but individual owners cannot fire the security guard. It doesn't matter directly, and you're not the manager of the security guard.

Legal basis: Article 285 of the Civil Law of People's Republic of China (PRC), a realty service enterprise or other manager shall, on the entrustment of the owner and in accordance with the provisions of the third part of this Law on realty service contracts, manage the buildings and their ancillary facilities within the building division, accept the supervision of the owner, and promptly answer the owner's inquiries about realty service.

Property service enterprises or other managers shall implement emergency measures and other management measures implemented by the government according to law, and actively cooperate with relevant work.