ProgRama is a Florida based instrument repair facility that fixed mine about 5 years ago for around $300, if I remember correctly.
They can be reached at www.programatools.com or 1-800-668-8843.
Their other business designs and manufactures scan and reset tools which are for sale.

Good luck...the 140 is the most troublesome model MB ever built!!

Tobias MB
3 MBs