In addition to Brucelee's suggestion, contacts in the parking brake switch may be dirty/corroded or loose. Could have a broken wire from the switch. Relay for top may be going bad.
Do you have a multi-meter to test the electrical connections down the line?
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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