KX-FL543RU (serv.man3) - Panasonic Fax Service Manual Supplement (repair manual). Page 7

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RTL (Retention Time Limited)
Notes:

1. The marking (RTL) indicates that the Retention Time is

limited for this item.
After the discontinuation of this assembly in production,
the item will continue to be available for a specific period
of time. The retention period of availability is dependent
on the type of assembly, and in accordance with the laws
governing parts and product retention. 
After the end of this period, the assembly will no longer be
available.

2. Important safety notice

Components identified by  (!)  mark have special charac-
teristics important for safety. When replacing any of these
components, use only manufacture's specified parts.

3. The S mark means the part is one of some identical parts.

For that reason, it may be different from the installed part.

4. ISO code (Example : ABS-HB) of the remarks column

shows quality of the material and a flame resisting grade
about plastics.

5. RESISTORS & CAPACITORS

Unless otherwise specified;
All resistors are in ohms (

Ω) k=1000Ω, M=1000kΩ

All capacitors are in MICRO FARADS (

µF) P=µµF

*Type & Wattage of Resistor