Annual Maintenance Contract with vendor

Dear Experts,

I am new to AMC cycle.

I have scenario like this ,

Can anyone suggest me how to execute this in sap

u2022 Get AMC Estimation from the party ( supplier/contractor ) and place purchase order.

u2022 Make Payment to the party ( supplier / contractor) and sign the contract .

u2022 Make Preventive maintenance / Brake down maintenance as per the contract

u2022 If required send the Equipment / Components to the party through returnable challan .

u2022 Receive the rectified equipment / components from the party and close the challan .

u2022 Create history for the same .

Your helps will be really appreciated

Thanks and Regards

V.Dhanasekaran