One year into a five-year project, the project manager realizes that the reason for high team turnover is that the team does not receive the same financial allowances as other teams that are working on the same project The project manager forecasts that with this high staff turnover rate, the project will suffer a two-and-a-half-year delay. The amount to cover additional disbursements was not included in the contract, and the project sponsor is unwilling to renegotiate.
What should the project manager do?