If a tenant who is 7 days or more in arrears in the payment of rent pays the full amount of rent due before the expiration of the 7-day notice in writing, that notice is void. Thereafter, in all residential tenancies at will, if the tenant pays all rental arrears, all rent due as of the date of payment and any filing fees and service of process fees actually expended by the landlord before the issuance of the writ of possession as provided by section 6005 , then the tenancy must be reinstated and no writ of possession may issue.