I'm not getting any data to display in my email template when passing the caseId to query the Case_Product_Name and Serial_Number__c fields from the "Problem" object.  I do get data when I hard code the caseId in the getSerials setter.  Keep in mind the case_id__c field is a string data type on the problem object" (its a formula field to make this email template easier to create intead of building a wrapper classs to get the data... the relationship between the objects are amaster-detail from Case to Case Product to Problem).

Any help would be greatly appreciated!  Thanks!

Email Template:

<messaging:emailTemplate subject="test" recipientType="Contact" relatedToType="Case">
    <messaging:htmlEmailBody >

        <c:Case_Product_Serials paramCaseId="{!relatedTo.Id}"/>          
    
    </messaging:htmlEmailBody>
</messaging:emailTemplate>

Component:

<apex:component controller="caseProductSerials" access="global">
    <apex:attribute name="paramCaseId" type="Id" description="Case Id parameter" assignTo="{!caseId}"/>
                <apex:repeat value="{!serials}" var="serial">
                   <apex:outputText value="{!serial.case_product_name__c}" />
                </apex:repeat>
 </apex:component>

 Controller:

public class caseProductSerials {
    
    Public Id caseId {get;set;}
    Public List<Problem__c> serials = new List<Problem__c>();
    
    public caseProductSerials() {
    }
    
    public List<Problem__c> getserials(){
        return [SELECT case_product_name__c, serial_number__c FROM problem__c where case_id__c =: caseId]; //'500Q0000003woSF'];
    }
    
}