public with sharing class otherButtonPreparationReportController {
    public otherButtonPreparationReportController() {

    }
    @AuraEnabled
    public static InitData init(String recordId){
        InitData res = new initData();
        try{
            Maintenance_Contract__c report =  [SELECT Id,RecordType_DeveloperName__c,Estimate_Target__c FROM Maintenance_Contract__c WHERE Id =: recordId LIMIT 1];
            System.debug(LoggingLevel.INFO, '*** opp: ' + report);
            res.Id = report.Id;
            res.RecordTypeDeveloperNameC = report.RecordType_DeveloperName__c;
            res.EstimateTargetC = report.Estimate_Target__c;

            System.debug(LoggingLevel.INFO, '*** res: ' + res);
        }catch(Exception e){
            System.debug(LoggingLevel.INFO, '*** e: ' + e);
        }
        return res;
    }   

    public class InitData{
       @AuraEnabled
       public String Id;
       @AuraEnabled
       public String RecordTypeDeveloperNameC;
       @AuraEnabled
       public String EstimateTargetC;
    }
}