Your exact answer is in the archives. Hit search above. Some light reading in the meantime: http://gdl-online.com/begin1.html

Do NOT NOT pay $1200 for cruise repair.

Search eBay and local wrecker's.

Contact GDL, Programma and/or George Murphy about rebuilt cruise amps.

Use GDL page for diagnosis.

See archives about resoldering successes of some of the "boys".

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)