not having made arrangements/contacts
with a local mechanic in case there were some kind of problem, etc

Having a local mechanic work on your plane only solves 1/2 the problem
because the plane is again illegal as soon as you get back to the
states since you would need another log entry from a U.S. mechanic. I
think its better to skip the Mexican mechanic and just have the A&P do
the work and don't let the Mexicans find out.

-Robert