Lenovo ThinkPad G41 Hardware Maintenance Manual page 142

Parts list
v Each FRU is available for all types or models, unless
specific types or models are specified.
v A CRU (customer replaceable unit) is identified by a
single asterisk (*) or two asterisks (**) in the CRU ID
column. An N in the CRU ID column means the part is
not a CRU. A single asterisk (*) means the part is a Tier
1 CRU; two asterisks (**) means the part is a Tier 2
CRU.
v FRUs marked with OP are available as options.
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ThinkPad G40, G41