My Raven has a flasher (not an insert) under the ramp exit that went out. In the playfield lamp/switch assignment schematic, it's labeled solenoid 7. In the driver board schematic, it shows solenoid 7 driven by Q56. Sure enough, it has cracked solder. Could be something like that.

Q1-4 are the 2N5879 transistors mounted under the playfield along the right side one of them may be bad. The playfield schematic refers to them as lightning bolts 1-3. There are resistors for them mounted somewhere also.

I just picked up a Hollywood Heat myself and I've been working through some lamp issues with mine. One of the bad lamps on mine turned out to be a bad solder connection on a lamp socket, even though it looked fine. I found it by testing for continuity with a multimeter.

Since both L15 lamps aren't working on your machine, it's most likely something else that's in common with both lamps. I would start by checking the 4 ohm resistor, R8. The resistors are mounted on a terminal strip on the bottom side of the playfield on the left side. They are 7 watt resistors and fairly large (about 2" long). There isn't any reference numbers marked on them so you'll have to locate the correct one using the wire color or checking continuity. It could also be a bad lamp driver transistor, Q3, or a problem on the driver board.

Have you seen the two lamps marked L13 (underneath the ramp) light up? I've checked everything out in the circuit and the lamps and wiring are all good, but I have never seen those lamps turn on. The interesting thing is that when I enter the lamp test mode and step through the lamps one at a time, it skips right over L13.

Let me know what you find. I'll be glad to help out however I can.