How many times have we heard this story before? A network takes a rapturously reviewed, difficult-to-sell program and shuffles it from one undesirable time slot to another before finally concluding that the show ''isn't finding an audience.'' The latest example: Brooklyn Bridge, whose last-gasp run of four original epi-sodes was slated by CBS for Friday nights at 8:30, the same deadly spot on the schedule where the program began its life nearly two years ago. No big surprise: Bridge finished 86th. The network seems to be devoting more of its attention to a newer lost cause, Robert Zemeckis' adventure-comedy Johnny Bago. In addition to putting Bago reruns on its late-night schedule, CBS tried airing two episodes in prime time last week, on Wednesday and Friday, to no avail-they finished in 74th and 78th place, respectively. last VIEWERS Top Twenty week

1 26.6 Home IMprovement (R) ABC, Wednesday, 9 p.m. 1 2 22.3 Baseball All-Star Game CBS, Tuesday, 8:40 p.m .- 3 21.0 Primetime Live ABC, Thursday, 10 p.m .6 4 18.8 20/20 ABC, Friday, 10 p.m. 5 5 18.6 Buddies ABC, Wednesday, 9:30 p.m.. - 6 18.4 60 minutes CBS, Sunday, 7 p.m. 3 7 18.3 Roseanne (R) ABC, Tuesday, 9 p.m. 2 18.3 Unsolved Mysteries (R) NBC, Wednesday, 8 p.m. 11 9 17.9 Movie: With A Vengeance (R) CBS, Sunday, 9 p.m. - 10 17.7 Murder, She Wrote (R) CBS, Sunday, 8 p.m. 7 11 17.6 48 hours CBS, Wednesday, 10 p.m. 13 12 16.3 Coach (R) ABC, Tuesday, 9:30 p.m. - 13 16.2 Seinfeld (r) NBC, Thursday, 9:30 p.m. 10 14 15.7 Dateline NBC NBC, Tuesday, 10 p.m. 12 15 15.6 Movie: K-9 (R) CBS, Saturday, 9 p.m. - 16 15.4 Murphy Brown (R) CBS, Monday, 9 p.m. 17 17 15.2 Full House (R) ABC, Tuesday, 8 p.m. 19 18 14.7 Step By Step (R) ABC, Friday, 8:30 p.m. 21 19 14.4 All-Star Pre-Game Show CBS, Tuesday, 8 p.m. - 14.4 Northern Exposure (R) CBS, Monday, 10 p.m. 15 Bottom Ten 85 6.2 Flying Blind (r) Fox, Sunday, 10 p.m. 89 86 6.0 Brooklyn Bridge CBS, Friday, 8:30 p.m. - 87 5.5 The Edge (R) Fox, Sunday, 10:30 p.m. 91 88 5.2 BEVERLY HILLS, 90210 (R) Fox, Tuesday, 8 p.m. 90 89 5.0 Melrose Place (R) Fox, Wednesday, 9 p.m. 88 90 4.9 Look of the Year Fox, Tuesday, 9 p.m. - 91 4.8 New Year ABC, Saturday, 9 p.m. - 92 4.7 Danger Theatre Fox, Sunday, 7:30 p.m. 87 93 4.5 Young Indiana Jones Chronicles ABC, Saturday, 8 p.m. 97 94 4.1 Parker Lewis (R) Fox, Sunday, 7 p.m. 94

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