o/d light flashing - quick hard shifts
 

I have recent problem with my 97 mpv (4wd) with the o/d light flashing all the time. The switch still works to turn the o/d on and off though. The vehicle shifts really quickly and/or hard since this started. I had it in the shop when it occured when they were replacing a leaky 'right front output shaft seal' and the front struts.
I realize searching the web indicates bad wiring, however with the recent work done, where could it go bad? Is there any wiring around where the work was performed that I should be locating to determine if its bad?