PHP Work Order / Project Tracker / script required

Looking for a basic CRM / job tracker script where jobs can be submitted and assigned to a user. The job listing will show as an organised table with edit and search functions. There will be a function to add notes for each entry along with the user who posted the entry. Along with the job listing there will also be an engineer list which can be allocated for each job. The engineer table will contain details of the engineer. Preferebly looking for a similar script already written which can be modified to suit as we require the system ready within weeks.