Transistor Replacement

[Dreato]

Further update. There are 2 versions of this board, one presented in the 1976 service manual (Board part # 00097-60002) and the 1982 service manual (board part # 00097-60910). Both manuals show Q4 as part # 1854-0071, but in the 1976 manual it's an NPN, and in the 1982 manual it's a PNP. The schematics are slightly different, too.

Any ideas?? I can't check the old transistors I removed - the tester showed them both at a pair of series resistors.