Thanks oPossum - I have in the meanwhile done a disassembly via MPLABX. You load the hex file as a prebuilt source to a new project. You then go to Window->PIC memory views->Program memory. You can also run the code in debug mode with the simulator and see for example what is written in SFRs.
I have downloaded the picdisasm and done a disassembly. Looks robust and matches the MPLABX disassembly - at least the part I am interested in.
Alex