PDP-11/44 problem - RUN stays on

I am still wondering if the messages "(Console V3.40C)", "(Program)", and the prompt ">>>" come from the same source ... As I don't have much clues, I decided to swap the MFM board (M7096). No luck, the symptoms are the same. Then I figured, if you can not halt the CPU, that must be "control". So, first I placed the original MFM board back in and the swapped the CTRL board (M7095). There is some progress, after I enter ^P, I get the response "(Program)" and the the prompt ">>>" ! I did the T and the E command, but for T/E and D commands I get "?CP halt". OK, makes sense ... but the H command gives the response "?Failed to halt". The RUN light remains on. So CTRL *seems* to be a partial solution. Any thoughts ? thanks, - Henk. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.