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1) Yes. The OD (control) switch IS replaceable — part # 1377164 for $19.79 ("internet" price) at http://www.tascavolvoparts.com//index.do
2) No. I've never heard of one causing OD (relay) to drop out. That would have to be a "shorted" switch. Most often it's the OD relay that fails with age. You could try replacing it yourself (see below).
3) NO
4) No. Replace the relay. Part# 1363444 is $32.33 at Tasca. See figure below.
Procedures are in the 700/900FAQ section. Use drop-down menu in upper right corner of window.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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