I modified the initial proposal text to point to the correct escrow contract at 0x8d803f7f7e26e586ee90e5a872cf7830e21f7727 where the startCooldown function can be called. The specs can be inferred from this proposal and the contract itself here: AuraArbBalGrant | Address 0x8d803f7f7e26e586ee90e5a872cf7830e21f7727 | Arbiscan