Should I replace garage door?

[Peter Morgan]

Hello,

The gear sprocket broke and the chain came off from the garage door opener in my rental, the technician advised me to replace the garage door opener with a new one and charged me $550 including replacing pulley. Is that a reasonable charge?Replacing gear sprocket seemed like a DIY project to me but I ended up giving in as the tenant wanted the garage fixed asap.He also indicated the garage door is in extremely bad shape and needs to be replaced asap and it can cost me up to three grand. Is that a reasonable estimate.The garage door is 15 year old.

Appreciate your inputs.

Thanks