Zoli HA1AG was very kind and installed the INRAD roofing filter kit into the radio. I bought this kit back in 2006 during my trip to Australia. (In the meantime I kept it in safe on the self for really long). Furthermore now I have K9AN bonus mod as well as the maintenance of antenna relays, connectors, internal battery and capacitor checks and VCO level assessments.
The plan is to test it in the WPX CW in couple of weeks time.
BIG TNX Zoli!!