Hello folks,,I was reading about your misfortunes,and decided to join and give my two cents worth
I am a independent Mobile RV tech,,this is what I have been doing to correct baffle problems,(this is not strictly a heartland problem)
1. refrigerators in a galley slide out have venting issues,,almost all of them
2.removing the refrigerator and constructing the correct baffles is the first step to correct the problem
3. Adding additional cooling fans seems to correct the problem
the last two RM1350's I have done ,I have added two additional fans mounted at the top of the upper vent,blowing out
I remove the 3 amp fuse for the fans and replace it with a 5 amp,,the extra fans are wired in parallel to the the existing fans
What my customers report is this,,,Normally ,before modifying the baffles ,and fans,,,,when ambient temps get high in the afternoon,the cooling fans will come on and run all day until evening. After baffles and fans,the fans come on and run for no more than 10 minutes at a time,refrigerator temps stay constant,and with 4 fans (the two factory and two additional)the fan noise seems quieter
Hope this helps,,I do have pictures,but as a new user,I am unable to post pictures
Rich M