The 2SJ419 is covered by this 100 KB PDF, filed under schematics though the part number points to a discrete transistor datasheet. In the JIS scheme, 2SJ denotes a P-channel field-effect transistor, often used as a high-side switch in power stages. The file name carries no maker, package or date. Open it in a normal PDF viewer to read the pin assignment and ratings, then measure the suspect device out of circuit with a diode-test meter before deciding whether a replacement is really needed.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.