International 4700 Diagnostic Code Info

Hi, I have a 1996 4700 with the 190 HP 444 diesel. The motor will not start. The problem has been developing for a few thousand miles as initially the motor would "miss" for a second once in a while. Then it began to not start every once in a while. It would start, then shut it off and try again and no start for 2 or 3 tries then on the fourth it would start again. Now it is DOA. Everything else works electrically. I went through posts here and checked the fuses in battery box. I have 2 Ford F350 diesels and know all too well the cam sensor problem. I replace the cam sensor on the International and still no good. I also looked at the battery voltage while cranking to see if it went too low to power the control module. Voltage dropped to about 10.8 VDC while cranking. I had this problem before with my Fords as well.

I saw a post about diagnostic codes, did the checks and came up with 543, 224 then 543, 615. Any ideas? I am guessing 1 code is about the brake hydraulic switch as It is broken and I haven't put the new one in yet. Any help or opinions would be appreciated.

Thanks!