I replaced my front unit with the Recpro Houghton. I have ran it for 1 summer and 1 winter. It is much quieter than a penguin and the heat pump works down into the 28 degree range. Very easy to install also.
In case you do not have the Magnum Manual I have attached it for you. In troubleshooting it tells you how to reset they system. Hope this helps.
64-0002 D (Owner Manual, ME Series).pdf
Just pull or back out of building if you think you are going to hit. Then turn it all the way both directions. I did not jack my front end when I changed to the the TRW to set the poppet without any problem.
It will be the rear brakes stuck. You can hit them with a hammer and break them loose. I just recently ripped my rear end because I couldn’t find a hammer where I was parked. So I tried rocking it and boom it stripped gears in the rear end. Only about a 5,000 fix. So beat them loose.
I just changed the alternator on my 2007 diplomat with a 400ISL. It appeared to be a P/N 8RG2142, it had overspray on it and hard to read. AJ - Electric will know what you need. I just replaced mine with one from them and was working like it should.
I wouldn’t worry about since you have driven it several thousand miles that way. I think you are suppose to check the oil level with the tube pushed in. It pulls out to make it easier to fill.
I can get measurements for you tomorrow from my 2007 Diplomat. If you call Source Engineering and talk to (Jim) if I remember the name correctly he knows exactly what you need. I just told him which motorhome I had and the fan he sent fit correctly. The hardest part is adjusting the shroud depth to fit in the middle of the new fan blades. I had to get a fan spacer and Jim knows that part number also.
Just PM me if still want the measurements.