We did end Bird's career in '92:
http://www.basketball-reference.com/teams/CLE/1992_games.html
East Conf Semis
Gm Date Tm Opp W/L Score Series
+--+----------+---+----+---+-------+-------------+
1 1992-05-02 CLE BOS W 101-76 CLE leads 1-0
2 1992-05-04 CLE BOS L 98-104 Tied 1-1
3 1992-05-08 CLE @BOS L 107-110 BOS leads 2-1
4 1992-05-10 CLE @BOS W 114-112 Tied 2-2
5 1992-05-13 CLE BOS W 114-98 CLE leads 3-2
6 1992-05-15 CLE @BOS L 91-122 Tied 3-3
7 1992-05-17 CLE BOS W 122-104 CLE wins 4-3
+--+----------+---+----+---+-------+-------------+