Bert;

I think you got the MiRS SFR mapping for individual satellite: (i.e. for the METOPs)
/cpc/prcp2/JOYCE/PTP/processes/MHS_RH6/source/map-MiRS-SFR_pop-fov_05deg_PTP_metop_auto_metopa+b_bert.f

I think you already have the latest version of the SFR combine program, combining the uncalibrated MiRS product from each satellite:
[note the combine of calibrated MiRS is not operational yet, just in tested in historical versions, so I give you what is
operationally available, upgrades will follow when they are ready}
/cpc/prcp2/JOYCE/PTP/processes/COMB_RH6/source/comb-MiRS-SFR_05deg_PTP-auto_15-min-bert.f

[ the original APCOMB I gave you ingested the old SFR product, not the MiRS ] 
/cpc/prcp2/JOYCE/PTP/processes/COMB_RH6/source/comb_05deg_PTP-auto_15-min_APCOMB_pps-prob-calb_sea-ice-screen_auto-bert.f

here is a version of APCOMB that ingests the latest combined MiRS SFR product which replaces the above program
/cpc/prcp2/JOYCE/PTP/processes/COMB_RH6/source/comb_05deg_PTP-auto_15-min_APCOMB_pps-prob-calb+MiRS-SFR_sea-ice-screen_auto-bert.f