This is an extention of the previous proposal (RB920385), which was awarded 7 days.The experiment has not been performed yet (scheduled in November), but we forsee thatadditional data points will be necessary to complete the experiment. Unfortunately nopreliminary data are available to support the request.We recall below the scientific aim of this programme.We propose a TF-muSR investigation of the superconducting properties of the Re(FeRu)AsOF compound (RE=La, Sm). The disruption of the superconductivity by increasing the Ru content will be studied via the analysis of the muon linewidth, in the range 0<y<0.4 for x=0.15.