diff --git a/Trigger/TrigValidation/TrigUpgradeTest/python/EmuStepProcessingConfig.py b/Trigger/TrigValidation/TrigUpgradeTest/python/EmuStepProcessingConfig.py
index 6e86de361d12cd8199c9a6459e0a0dc145e2b2da..b8416d02058a2d3c7c9eb38883820a1e1771993d 100644
--- a/Trigger/TrigValidation/TrigUpgradeTest/python/EmuStepProcessingConfig.py
+++ b/Trigger/TrigValidation/TrigUpgradeTest/python/EmuStepProcessingConfig.py
@@ -203,8 +203,11 @@ def generateL1DecoderAndChains():
 
      
         CombChains =[
-            makeChain(name='HLT_mu6_e8_L1MU6_EM5',  L1Thresholds=["MU6","EM5"], ChainSteps=[ ChainStep("Step1_mu_em", [emptySeq1, el11], multiplicity=[1,1], comboToolConfs=[dimuDrComboHypoTool]),
-                                                                                             ChainStep("Step2_mu_em", [mu21, el21], multiplicity=[1,1])] ),
+            makeChain(name='HLT_mu6_e8_L1MU6_EM5',  L1Thresholds=["MU6","EM5"], ChainSteps=[ ChainStep("Step1_mu_em_serial", [mu11, emptySeq1], multiplicity=[1,1]),
+                                                                                             ChainStep("Step2_mu_em_serial", [emptySeq1, el21], multiplicity=[1,1])] ),
+
+            #makeChain(name='HLT_mu6_e8_L1MU6_EM5',  L1Thresholds=["MU6","EM5"], ChainSteps=[ ChainStep("Step1_mu_em", [mu11, el11], multiplicity=[1,1], comboToolConfs=[dimuDrComboHypoTool]),
+            #                                                                                 ChainStep("Step2_mu_em", [mu21, el21], multiplicity=[1,1])] ),
 
             makeChain(name='HLT_mu6Comb_e8_L1MU6_EM5', L1Thresholds=["MU6","EM5"], ChainSteps=[ ChainStep("Step1_mu2_em", [mu12, el11], multiplicity=[1,1]),
                                                                                                 ChainStep("Step2_mu_em", [mu21, el21], multiplicity=[1,1])] ),