As promised, I am sharing the information provided to me to repair my Penguin A/C. Our model number is 610015.305, which is a 13,500BTU non-ducted roof top unit. I am figuring this is an original unit from when our coach was built, which would make it around a 1992 model year. According to some paperwork that I found, there are two "circuit boards" that basically control this unit. One is inside the interior shroud behind the control face plate and called the control board. It has a ribbon cable on it that plugs into the ribbon cable from the other board located inside the upper unit itself called the main board. Here is where it got interesting. According to the paperwork, I needed a Dometic part #3101625.006 for the control board and part #3101626.004 for the main board. If you read my other post in Tech Talk, I was out searching for one and then the other of these parts. Dometic does NOT have them. Anyway, I sent out e-mails to anyone and everyone I could and finally got a response from a contact on eBay. (Note: Just because someone is selling a part on eBay that is not the right one for you, don't be afraid to send them a question and ask if they can help with what you need. Worked for me!) Anyway, Kim from WWW.RVPARTSAROUNDTHECLOCK.COM said that they could help. As far as the main board was concerned, I was told that part number changes have occurred... 3101626.004 goes to 3104232.008 goes to a 3104233.006. This is what I purchased and it was an exact replacement and the A/C unit is up and working again. No modifications needed. Just remove and replace. As far as the control board was concerned, 3101625.006 changed to a 3101625.014, which is what I purchased also.
So, if you have an older Duo Therm Penguin that has any of these part numbers in them, you can use one of the other part numbers shown and it should be an exact replacement!
Some other part number's in the unit that may be of some help to someone: Heat Strip is #3101121, Start Capacitor is #3100236.219 and the Run Capacitor is #3100248.073.
Hope this helps someone some day. And remember, DON'T THROW OUT THOSE OLD COMPONETS UNTIL YOU STRIP THEM OF WORKING PARTS!!!

I had the same unit, with a similiar problem. However, it WASN'T the circuit board, but rather the ribbon cable had 2 broken wires where it was soldered to the board. Thanks to Carl Flack (when he lived in TN) and his soldering iron, I restripped and re-soldered the connections, and all was well for another year or two when the compressor croaked.