Had an '86 560SL and loved it. As to brake squeal, just had a long lasting problem with my daughters E350. Only cure was to purchase MBZ OE pads. The older SL's really don't need a specialist shop as they are not very complicated cars. Any experienced shop with access to manuals can work on them but you should invest in a scanner to give you an idea of what you are up against. A fairly inexpensive scanner will work fine on that car. When I park in SF I leave the windows down and unlocked to avoid a broken window or sliced top.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles