southernman

Hello folks, perhaps someone could help me with a little problem that developed today.

I have a 2003 F-350 with a gas engine, 110,000 miles, never any problems. It does however have an exhaust leak on the right side.

A few months back I had a warranty issue with our new F-150 and was given a "free" oil change so today I took in the F350 that I always service for the free oil change.
While in the shop I ask for an estimate on replacing the right side manifold and they replaced the air filter.

5 minutes after leaving the shop I stopped at the building material yard and when I started loaded the bed with lumber the horn alarm went off, it did this a total of 4 times while I was there. When I left the material yard the door lock system started clicking over and over. It did this over 500 times in the next 2 hour drive home.

Neither one of this issues have ever happened before today

Question, what could my problem be and could the shop have done something to cause it, never had this problem before.

Thanks in advance for any help.