Hello gurus,
I'm trying to be a better developer by writing the test code first.  I can't create all the needed test objects.  Account, Contact, Case are created and I can see the IDs in the debug log but get an error when creating the Asset.  What am I overlooking?

There is no other code created yet.
 

@IsTest(SeeAllData=True)

public class AssetUpdateTest {
    
    public static testmethod void testAssetLink()    {
        Account acc = createAccount(); 
        Contact con = createContact(acc); 
        Case cas = createCase(acc,con); 
        Asset ast = createAsset(acc,con,cas); 

        System.debug('**************************   Case ID: ' + cas.id); 
        System.debug('**************************   Case.Asset: ' + cas.AssetId);
        
    }
    
    public static Account createAccount(){
        Account theAccount = new Account(
            recordtypeid='01270000000Q7rQ', 
            name='Test Account', 
            Status__c='Client',
            Line_of_Business__c='CRS',
            phone='8005551212', 
            currencyisocode='USD'); 
        
        insert theAccount;
        return theAccount; 
    }    
    
    public static Contact createContact(Account theAccount){
        Contact theContact = new Contact(
            recordtypeid='01270000000Q7ra',
            email='tim.bouscal@audatex.com', 
            firstname='George', 
            lastname='Washington',
            accountid=theAccount.id);
        insert theContact;        
        return theContact; 
    }
    
    public static Case createCase(Account acc, Contact con){
        Case theCase = new Case(
            recordtypeid='01270000000Dy9u', 
            AccountId = acc.Id, 
            ContactId = con.Id,             
            
            Requestor__c=con.Id, 
            Reason='New Account Setup', 
            Reason_Detail__c='New - ADXE Shop 02',
            Status='New', 
            Origin='Sales Request', 
            Subject='AssetUpdateTest Sample BisOps Case', 
            Description='This is a sample case for testig the AssetUpdate class'
        ); 
        insert theCase; 
        return theCase;
    }    
    
    public static Asset createAsset(Account acc, Contact con, Case cas){
        System.debug('***** ***** ***** Account ID: ' + acc.id + '     Contact Id: ' + con.id + '     Case ID: '+ cas.Id); // all 3 values show in debug log
        Asset theAsset = new Asset(
            Name='Test Asset', 
            Account = acc, 
            Contact = con, 
            Case_Number__c = cas.CaseNumber, 
            Type__c='New', 
            Status='Purchased', 
            Description='This is a test asset for testing the AssetUpdate class'
        );
        insert theAsset; 
        return theAsset; 
    }
}

Error: 
System.DmlException: Insert failed. First exception on row 0; first error: FIELD_INTEGRITY_EXCEPTION, Every asset needs an account, a contact, or both.: [AccountId, ContactId]

Class.AssetUpdateTest.createAsset: line 69, column 1
Class.AssetUpdateTest.testAssetLink: line 9, column 1